Handle external issues in IssueReferenceFilter

Handling of external issues was broken when I refactored
`IssueReferenceFilter` to use fewer SQL queries.

Fixes #18827

See merge request !4789

Update docs based on customer upgrade from 4.0

## What does this MR do?

Adds helpful notes to early upgrade docs. Without these helpful hints it will be really hard for most people to upgrade from early versions to later versions. 

The tip about doing database migrations to version 6.1, then migrating iids, then migrating the database all the way was based on a tip from https://github.com/gitlabhq/gitlabhq/issues/7869. It worked really well!


See merge request !4409

Update Todos documentation and screenshots to include new functionality.

Updates documentation for todos, includes updated and new screenshots.

See also !4502 and #18906 

Closes #18923

[ci skip]

See merge request !4840

Time for 8.10.0-pre

See merge request !4852

Hide nav arrows by default

## What does this MR do?
- Fixes the arrow icon flashing on page load
- Removes settings dropdown at higher breakpoint
- Removes unneeded CSS

Closes #18941

## Screenshots (if relevant)
Arrow flashing bug:    
![icon](/uploads/3db95626acd0adb37438bdbc2c4aa154/icon.gif)

Settings dropdown breaking nav:    
<img src="/uploads/4351035f4cf8cb9fd892b621e6339e50/Screen_Shot_2016-06-21_at_4.25.50_PM.png" width="800px">

@alfredo1 would you mind double checking this to make sure the arrow flashing is definitely not happening? 

See merge request !4843

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

[ci skip]
Signed-off-by: Rémy Coutable <remy@rymai.me>

Refactor labels docs

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/18555

See merge request !3347

Clarify artifact expiry

## What does this MR do?

Clarifies documentation about artifact expiry.

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

## Why was this MR needed?

## What are the relevant issue numbers?

## Screenshots (if relevant)


See merge request !4831

Document `GIT_STRATEGY` and `GIT_DEPTH`

## What does this MR do?

Documents `GIT_STRATEGY` and `GIT_DEPTH`. Also fixes the TOC since the anchors weren't working.

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

The TOC and the location of the new entries.

## Why was this MR needed?

## What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ci-multi-runner/merge_requests/188

## Screenshots (if relevant)

![image](/uploads/eccfd60199d81e6588c13aab817f0eb5/image.png)

![image](/uploads/bbbffe61db64ef17f1fa52907275f3d4/image.png)

/cc @axil @ayufan 

See merge request !4720

- Add new images to match the new UI
- Document the new prioritize feature

Wrap code blocks on Activies and Todos page

## What does this MR do?

wrap code blocks on Activities and Todos page

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

Can `white-space: pre-wrap` be used for code blocks everywhere?

## Why was this MR needed?

Content of code blocks is cut on small screen sizes.

## What are the relevant issue numbers?

closes #18855

## Screenshots

![activities-code](/uploads/83eb5100dbcc34ade8892e9f68bf767f/activities-code.png)

![todos-code](/uploads/80efbf4875c9f5db1f1a3790fc8afa3b/todos-code.png)


See merge request !4783

import/export docs

Added documentation for and closes https://gitlab.com/gitlab-org/gitlab-ce/issues/3050

Also added a couple of rake tasks that might be useful.

See merge request !4732

Expand on Award Emoji documentation, update/add screenshots.

Adds documentation for award emoji now that comments can be awarded with emojis.

See also !4291 and #18906 

Closes #9091

cc: @virtuacreative @axil 

See merge request !4839

Add some docs for Docker Registry configuration - Relatively important for anyone installing from source

There have been a few issues created because of the lack of documentation for how to configure Docker Registry when installing from source, specifically what the `realm` needs to be and the `service`

These 2 bits of info will stop a lot of headaches 👍 

Issues:
https://gitlab.com/gitlab-org/gitlab-ce/issues/17957
https://gitlab.com/gitlab-org/gitlab-ce/issues/17991

See merge request !4738

fix import/export error typo

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/18948

See merge request !4847

* Adds pipelines page to CI docs.
* Adds image of pipelines list (although currently missing border that is on other images).
* Changes CI to CI/CD in `/doc` and `/doc/ci`
* Sorts user documentation in `/doc`

Partially fixes #17733.

See merge request !4660

Add documentation and examples for configuring cloud storage for registry images.

## What does this MR do?
Adds documentation and examples for configuring cloud storage for registry images.

Waits for backend config to get merged in: 
https://gitlab.com/gitlab-org/omnibus-gitlab/merge_requests/816

## What are the relevant issue numbers?

https://gitlab.com/gitlab-org/omnibus-gitlab/issues/1320
## Does this MR meet the acceptance criteria?

- [ ] ~~[CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added~~
- [x] [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~~
  - [x] 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)

cc\ @marin

See merge request !4812

Fix Network graph links.

## What does this MR do?

Fixes the Network graph links so they no longer link to `/master#{escape_javascript(@commit_url)}`

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

Don't think so.

## Why was this MR needed?

Single quotes don't evaluate Ruby expressions.

## What are the relevant issue numbers?

Fixes #18894.

cc: @jschatz1 

See merge request !4832

Fix auto-MR-close text from branch name

## What does this MR do?

Fix the MR-auto-close feature if a branch name begins with an issue IID.

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

It's one line, so check that line thoroughly 😃

## Why was this MR needed?

When I create a new MR from a branch starting with an issue IID, the description doesn't get suffixed with the 'Closes #blahblah' that it should do.

## What are the relevant issue numbers?

Don't think there are any.

## Screenshots (if relevant)

## Does this MR meet the acceptance criteria?

- [ ] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added

See merge request !4836

Display group/project access requesters separately in admin

## What does this MR do?

It displays the access requesters in a separate list in group & project members pages.

It also harmonize the members counter UI to use `%span.badge` everywhere (in the admin & non-admin members views).

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

No.

## Why was this MR needed?

To not confuse access requesters with actual members.

## What are the relevant issue numbers?

Closes #18871.

## Screenshots

### Group members

| Before | After |
| --------- | ---- |
| ![group-members-before](/uploads/2f15137e073fd3a63bc2cb7b2217cb6c/group-members-before.png) | ![group-members-after](/uploads/5b643974505cfa57783fa0320d3bf8b2/group-members-after.png) |

### Project members

| Before | After |
| --------- | ---- |
| ![project-members-before](/uploads/9c48dcd3736e42de84061b1201ee0b06/project-members-before.png) | ![project-members-after](/uploads/8e04c92ef0bba3de7e2405618632b27d/project-members-after.png) |

### Admin group members

| Before | After |
| --------- | ---- |
| ![admin-group-members-before](/uploads/7fda8c2c94b697bea6655ba892ba45e7/admin-group-members-before.png) | ![admin-group-members-after](/uploads/ea25717001794f75939c679b80308c3a/admin-group-members-after.png) |

### Admin project members

| Before | After |
| --------- | ---- |
| ![admin-project-members-before](/uploads/ba9d3ec52adbda6bb3d45ad9ac5243d3/admin-project-members-before.png) | ![admin-project-members-after](/uploads/3b889a029a9756e9ed2781b45c4dd9cb/admin-project-members-after.png) |

## Does this MR meet the acceptance criteria?

- [x] No CHANGELOG since this is related to the original "request access" MR.
- [ ] 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 !4798

Resolve "Destroying a project causes post_decline_request to be executed"

## What does this MR do?

Ensure we don't send "access request declined" to access requesters when a project is deleted.

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

I've created a service to decouple the notification sending from the AR model.

## Why was this MR needed?

Because there was an issue.

## What are the relevant issue numbers?

Fixes #18755, #18750.

## Does this MR meet the acceptance criteria?

- [x] No CHANGELOG needed.
- [x] 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)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

See merge request !4744

Update mail_room to 0.8.0 to resolve #13357

Update mail_room to 0.8.0 to resolve #13357

Which includes the fix from:
https://github.com/tpitale/mail_room/pull/73

See merge request !4835

Hide nav arrows by default; remove settings dropdown btn at larger breakpoint; remove unneccessary CSS

Resolve "Graphs and Wiki subnav"

## What does this MR do?
Styles sub nav in `Wiki` and `Graphs`

## What are the relevant issue numbers?
Closes #18533 

## Screenshots (if relevant)
![Screen_Shot_2016-06-15_at_9.32.43_AM](/uploads/111dae6e1b9c7d8038ac88b9be6f76a2/Screen_Shot_2016-06-15_at_9.32.43_AM.png)

cc @dzaporozhets 

See merge request !4678

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Add information about manually creating Todos from issue and merge request sidebars.

[ci skip]

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>