Browser interface allows forking to an owned grup.
This commit brings API up to speed by providing optional namespace
parameter to fork API. This allows forking to users and groups under
forker's control using their id or unique name.

Fixes #21591

Refactor merge requests documentation

## What does this MR do?

Add more information on merge requests.

## Moving docs to a new location?

See the guidelines: http://docs.gitlab.com/ce/development/doc_styleguide.html#changing-document-location

- [x] Make sure the old link is not removed and has its contents replaced with a link to the new location.
- [x] Make sure internal links pointing to the document in question are not broken.
- [x] Search and replace any links referring to old docs in GitLab Rails app, specifically under the `app/views/` directory.
- [x] If working on CE, submit an MR to EE with the changes as well.

---

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/21857

See merge request !6202

Move CHANGELOG entries of !5361, !5451 and !5887 from 8.11 to 8.12

## What does this MR do?

Move CHANGELOG entries of !5361, !5451 and !5887 from 8.11 to 8.12

## Why was this MR needed?

They were wrongly added to 8.11 here:

- https://gitlab.com/gitlab-org/gitlab-ce/commit/220755f52ad6e3fdfa43c62e0a4a4051721246dc#note_14900001
- https://gitlab.com/gitlab-org/gitlab-ce/commit/87f93ceb9542c415d6c23c72ff93d63272107d54

See merge request !6189

Signed-off-by: Rémy Coutable <remy@rymai.me>

Fix missing flash messages on service edit page

## What does this MR do?

This MR fixes missing post-update flash notifications for service edit page. Bug was introduced in https://gitlab.com/gitlab-org/gitlab-ce/commit/76aad9b76ed756ca9ba2cbcdb399c815e542b3ae#3ca7aff54d2814b971a98a7bf2837e07ab3dfa04_21_20 and caused by passing `notice: Successfully updated.` to path helper instead of passing it to `redirect_to` due to wrong parenthesis placement.

## Why was this MR needed?

While adding HipChat integration I noticed that no messages are being displayed after clicking on "Save changes" button. I looked into code and observed that there is a code for these messages which once worked but doesn't work anymore. It's a regression which should be fixed.

## Screenshots (if relevant)

![image](/uploads/32b851e5bdc2a6438f35061473db9650/image.png)

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- Tests
  - [x] Added for this feature/bug
  - [x] All builds are passing
- [x] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

See merge request !6195

Safer ref updates

Use `git update-ref` to prevent clobbering concurrent ref updates. If
rugged/libgit2 is temporarily confused, due to concurrent `git gc` for
example, then it used to be possible to accidentally reset a ref to an
earlier state and lose commits. Because `git update-ref` does not get
confused by `git gc`, what will happen now is that the commit based on
confused information fails, preventing data loss.

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/20353

See merge request !6130

Add documentation on template dropdowns

## What does this MR do?

Add docs for the dropdown template selectors

/cc @axil 

See merge request !4865

Update README.md

Added a line to the SSH Key Gen section, to ensure that the `before_script` does not prompt for a passphrase.

See merge request !6176

Add link on API docs index page



See merge request !6190

Fix randomly failing specs in expand_collapse_diff_spec:

This MR fixes the following random failure in a spec:

```
 Failure/Error: namespace.human_name + ' / ' + name

     ActionView::Template::Error:
       undefined method `+' for nil:NilClass
     # ./app/models/project.rb:807:in `name_with_namespace'
     # ./app/views/layouts/project.html.haml:1:in `_app_views_layouts_project_html_haml___2918737809244135908_70160161538920
'
     # ./app/controllers/projects/commit_controller.rb:23:in `show'
     # ./lib/gitlab/request_profiler/middleware.rb:15:in `call'
     # ./lib/gitlab/middleware/go.rb:16:in `call'
     # ./lib/gitlab/middleware/static.rb:9:in `call'
     # ------------------

     # --- Caused by: ---
     # NoMethodError:
     #   undefined method `+' for nil:NilClass
     #   ./app/models/project.rb:807:in `name_with_namespace'
```

Capybara's `click_link` method doesn't actually wait for the page to reload.
When the `expand_all_diffs` parameter is used, we need to search for unique
elements that appear to ensure that the page has actually reloaded.

Closes #21841

See merge request !6193

```
 Failure/Error: namespace.human_name + ' / ' + name

     ActionView::Template::Error:
       undefined method `+' for nil:NilClass
     # ./app/models/project.rb:807:in `name_with_namespace'
     # ./app/views/layouts/project.html.haml:1:in `_app_views_layouts_project_html_haml___2918737809244135908_70160161538920
'
     # ./app/controllers/projects/commit_controller.rb:23:in `show'
     # ./lib/gitlab/request_profiler/middleware.rb:15:in `call'
     # ./lib/gitlab/middleware/go.rb:16:in `call'
     # ./lib/gitlab/middleware/static.rb:9:in `call'
     # ------------------

     # --- Caused by: ---
     # NoMethodError:
     #   undefined method `+' for nil:NilClass
     #   ./app/models/project.rb:807:in `name_with_namespace'
```

Capybara's `click_link` method doesn't actually wait for the page to reload.
When the `expand_all_diffs` parameter is used, we need to search for unique
elements that appear to ensure that the page has actually reloaded.

Closes #21841

[ci skip]

Remove suggested colors hover underline

## What does this MR do?
* Removes the blue hover underline for the suggested color containers 
* Added `cursor: pointer` to the suggested color containers  

## Are there points in the code the reviewer needs to double check?
Shouldn't be 😄 

## Why was this MR needed?
Improves UI

## Screenshots (if relevant)
Before:
![DS48AvgSVX](/uploads/0077e7a5837c8ce9fe2493ad6a42a018/DS48AvgSVX.gif)

After:
![olZzS68WNr](/uploads/4e0ae808c69942a528f1303df8cddeae/olZzS68WNr.gif)

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- Tests
  - [x] All builds are passing
- [x] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?
Closes #21792

See merge request !6165

Fix alignment of icon buttons

## What does this MR do?

Fix misalignment of buttons with only an icon which was introduced by !5451.

## What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/5451#note_14066627

## Screenshots

### Before

![with-text](/uploads/aa7f7a98e2015070689e762e0cf99844/witht-text.png)

![without-text](/uploads/72db7c54e3961fd0df34b0ea79455fd0/without-text.png)

### After

![with-text](/uploads/3f19e55773083bcb22f3909f6dc0d147/witht-text.png)

![without-text](/uploads/b6647d4d71eb5cd9d1712908d2b93665/without-text.png)


See merge request !5887

Fix markdown anchor icon interaction

## What does this MR do?
Fixes and improves the markdown anchor icon interaction so that hovering over any headers (generated through markdown) will have an anchor icon that's easily accessible (won't hide from you on edge cases), replaced the icon with fontAwesome icon and added more padding for the anchor icon.

## Are there points in the code the reviewer needs to double check?
1.  Need to check if it's okay to replace the icon-link.png with fontAwesome
2. Need to check if it's okay for the additional view padding on views that render markdown to compensate for anchor link space
3. Need to check if there are any other views that render markdown that did not have it's padding re-adjusted

## Why was this MR needed?
Improve markdown rendered anchor links so that they are more user friendly

## What are the relevant issue numbers?
Closes #20459 

## Screenshots (if relevant)
Before:
![Screen_Shot_2016-07-30_at_2.31.43_PM](/uploads/12b2aad7f130d26a709ff28083ecc2e3/Screen_Shot_2016-07-30_at_2.31.43_PM.png)

After:
![Screen_Shot_2016-08-08_at_10.25.06_AM](/uploads/caac1985cfbd305b8c8665d86e30ab24/Screen_Shot_2016-08-08_at_10.25.06_AM.png)

Before:
![https://gitlab.com/gitlab-org/gitlab-ce/uploads/45e6d0aee7abbdb42a4c781ae0ba1961/ws7MBrK70g.gif](https://gitlab.com/gitlab-org/gitlab-ce/uploads/45e6d0aee7abbdb42a4c781ae0ba1961/ws7MBrK70g.gif)

After:
![nLQOMn9RUO](/uploads/3905ceac2d591399d14cec1b3319f46b/nLQOMn9RUO.gif)

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- Tests
  - [x] All builds are passing
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

See merge request !5577

Added `.term-bold` declaration.

## What does this MR do?

Added `.term-bold` declaration.

## Are there points in the code the reviewer needs to double check?

## Why was this MR needed?

https://gitlab.com/gitlab-org/gitlab-ce/issues/21471#note_14874299

## Screenshots (if relevant)

## Does this MR meet the acceptance criteria?

- [ ] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [ ] API support added
- Tests
  - [ ] Added for this feature/bug
  - [ ] All builds are passing
- [ ] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [ ] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [ ] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [ ] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?

Closes #21471

See merge request !6171

Align add button on repository view

## What does this MR do?
Top aligns the add button to the other UI elements adjacent to it 😄 

## Are there points in the code the reviewer needs to double check?
Shouldn't be

## Why was this MR needed?
Fixes a UI inconsistency 

## What are the relevant issue numbers?
Closes #21168 

## Screenshots (if relevant)
Before:
![Screen_Shot_2016-08-24_at_3.53.00_PM__2_](/uploads/5d6d765bb8a1d640170805ec32956790/Screen_Shot_2016-08-24_at_3.53.00_PM__2_.png)

After:
![Screen_Shot_2016-08-24_at_3.52.44_PM__2_](/uploads/1db9f0f68ef5defa4dd111d7dae1dc26/Screen_Shot_2016-08-24_at_3.52.44_PM__2_.png)

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- Tests
  - [x] All builds are passing
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

See merge request !5971

Convert datetime coffeescript spec to ES6

## What does this MR do?
Converts the last remnant coffeescript file to ES6

## Are there points in the code the reviewer needs to double check?
None

## Why was this MR needed?
Because we aren't using coffeescript anymore 🎈 

## What are the relevant issue numbers?
#21472 

## Screenshots (if relevant)
None

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- Tests
  - [x] All builds are passing
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

See merge request !6045

Hides merge request section in edit project when disabled

## What does this MR do?

Correctly hides the merge request section in the project edit page when disabled. It used to work before the feature visibility part was changed to dropdown - so added a test to prevent in future! 👍 

## Screenshots (if relevant)

![hide](/uploads/eb72ef87bad19c2716472a0c1031fd32/hide.gif)

See merge request !6175

Commit message blocks

#### What does this MR do?
* Wraps code commit message blocks
* Consolidates similar shades of gray (cc @cperessini @tauriedavis)

Related to #20831 

#### Screenshots (if relevant)
Before:  
![Screen_Shot_2016-08-19_at_10.41.07_AM](/uploads/4529d178123e18b0aad35a252061902b/Screen_Shot_2016-08-19_at_10.41.07_AM.png)
After: 
![Screen_Shot_2016-08-19_at_10.40.42_AM](/uploads/499818f360e7c3cd9d31bc335cae1a82/Screen_Shot_2016-08-19_at_10.40.42_AM.png)



See merge request !5906

Fix expiration date picker after update

@DouweM this object is now on `gl`, not on the window. It would only break when trying to use the date picker on a newly-inserted member element, but I figure it's probably worth sneaking into a patch.

See merge request !6184

Moved builds panel to the bottom of the builds sidemenu (and change retry link colour)

## What does this MR do?

Moves the builds panel to the bottom of the builds sidemenu.

Changes the `Retry` link to look more _linky_. 🖇  

## Are there points in the code the reviewer needs to double check?

## Why was this MR needed?

On small screens, the builds panel must be scrolled through before you can get to the details of the build you're looking at.

## What are the relevant issue numbers?

Closes #21122

## Screenshots (if relevant)

![Screen_Shot_2016-08-20_at_17.41.51](/uploads/84f10c43011da514ef8ac1b1d20eb5d5/Screen_Shot_2016-08-20_at_17.41.51.png)

## Does this MR meet the acceptance criteria?

- [ ] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [ ] API support added
- Tests
  - [ ] Added for this feature/bug
  - [ ] All builds are passing
- [ ] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [ ] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [ ] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)
Closes #21122

See merge request !5923

Handle error on trace raw download with old builds (DB stored)

## What does this MR do?

Handles error on `raw build trace` download action for old builds (which are stored in DB instead of file).

## Are there points in the code the reviewer needs to double check?

No.

## Why was this MR needed?

At the beginning build traces were stored in database but at some point we moved to store them in files. All trace related actions are aware of this, but not `raw trace download`.

## What are the relevant issue numbers?

Fixes #18900

## Does this MR meet the acceptance criteria?


- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [ ] ~~[Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)~~
- [ ] ~~API support added~~
- Tests
  - [x] Added for this feature/bug
  - [x] All builds are passing
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [ ] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

See merge request !4822