Simplifies activity spawning when dependencies are conditionally set:
  activate(
    after_tag=some_value if some_condition else None,
  )
instead of having to do a ** dance.
All columns involved in dependency checking are declared NOT NULL, so providing
"None" and expecting a dependency to happen was already not working.
This change pushes this one step further by allowing activity
auto-validation also happen on these activities.
Also, simplify getOrderValidationText: avoid iterating on keys and then
retrieving values, use a list-comprehension, simplify condition.
Add a test for after_tag, also covering activity auto-validation.

Unit Tests: login*() with a non-ERP5TypeTestCase user was adding ERP5TypeTestCase user anyway and failure was silently ignored.

checkValidity calls getContent, which uses the same mutex

Improve the query speed by using the default listbox sort.

OfficeJS's user blocking third party cookie will at least stop entering their credentials many times for nothing

Followup of nexedi/erp5@340accd1

Conflicts:
	bt5/erp5_web_renderjs_ui/PathTemplateItem/web_page_module/rjs_gadget_erp5_nojqm_css.xml

In ERP5 software release we now have `mock` egg installed, so we can use it in tests instead of doing manually like this:

```python
saved_method = Class.method
def patched_method():
  ...
try:
   Class.method = patched_method
   ...
finally:
   Class.method = saved_method
```

/reviewed-on nexedi/erp5!882

Change the caching policy to one hour.

Use the CDN to publish the page if the backend is down

Cache the manifest like the HTML page but force refreshing the manifest to prevent CDN cache inconsistency.

Defining it inside portal_components ledds to business template update issue.
Bypass it by defining the expected behaviour into the web section hook.

Allow the CDN to cache the content.

Use stale_if_error to allow the CDN to return content if backend is down

Unify Vary Header.

erp5_banking_cash depends from erp5_trade via erp5_banking_core.

Gadgets:

* Support `changed` flag from `erp5.js`: 

![unsaved changes sreenshot](/uploads/cff30eae0a5d87df26bac13d43e1da3f/image.png)

* Comply with translation protocol used in ERP5JS. This does not translate, because it would not be easy ( ERP5JS translate client side with a json database of message, but in xhtml style the translation is performed server side with localizer) and not so important now. What matters is just that we can somehow reuse gadgets.

Style:

* While we are at it, fix a minor annoyance that the button in "long" dialogs where not easy to reach, at least on chrome

![before](/uploads/e03a8311571806a55fd72f6923cf855a/Screenshot_2019-05-31_at_10.38.05.png)

![after](/uploads/5753bc44fbc0f69b6adfeb14b3367236/Screenshot_2019-05-31_at_10.38.37.png)

/reviewed-on nexedi/erp5!880

Remove all globals to allow multiple live tests running on the same page.
Stop reading the test output if the browser tab doesn't have the focus.
Stop hardcoding the URL in the javascript.
Stop hardcoding other fields path in the javascript (+ embed the textarea in the gadget).

Propagate all parameters via formulator.
It will allow to use this gadget from another context document.

Run live test from the RJS UI

This way we can use gadgets using of ERP5JS translation API in xhtml
style.
This is really minimal compatibility layer and translation is not
actually performed.

Sorting in a module is terrible for performance as soon as there is more
than a trivial amount of documents in that module.

Test was failing because family mapping is loaded while connection is
already closed.

```
Traceback (most recent call last):
  File "erp5/Products/ERP5/tests/testInvalidationBug.py", line 156, in testLateInvalidationFromZEO
    activity_tool.tic()
  File "erp5/product/ERP5Type/tests/ProcessingNodeTestCase.py", line 96, in tic
    self._orig_tic(processing_node, force)
  File "erp5/product/CMFActivity/ActivityTool.py", line 1326, in tic
    node_family_id_set = self.getCurrentNodeFamilyIdSet()
  File "erp5/product/CMFActivity/ActivityTool.py", line 921, in getCurrentNodeFamilyIdSet
    return self._getNodeFamilyIdDict().get(getCurrentNode(), ())
  File "ZODB/Connection.py", line 909, in setstate
    self._setstate(obj, oid)
  File "ZODB/Connection.py", line 953, in _setstate
    p, serial = self._storage.load(oid, '')
  File "ZEO/ClientStorage.py", line 825, in load
    result = self.loadBefore(oid, m64)
  File "ZEO/ClientStorage.py", line 839, in loadBefore
    raise ClientDisconnected()
ClientDisconnected
```

Load the object explicitly before so that it's in cache.

/reviewed-on !881

SlapOS and NMS documentation are moved into bt and committed in erp5-doc.git. This will allow to install documentation in another erp5 and also to test them.

/reviewed-on !875

3 independent conditions does not guarantee to find the next row sorted
simultaneously on those 3 values.

listActions result is cached, and may refer to non-existing workflows
and/or worklists. Tolerate either of these being missing.

This way the "you have unsaved changes" pops up also when navigating
away after changing gadget content.

When the page height is larger than viewport, the scrollbar hides the
button on chrome.  Also does the "Loading" status message on chrome.
By using a margin, we make sure buttons are not behind scrollbar or
status message and are easier to reach.