erp5_web_renderjs_ui: keep previous focus color

* add color in the commit tree
* send one json only
* display the list of removed files in the gadget diff
* translate gadget
* desactivated changelog

See nexedi/erp5@ea219b74

RSVP.Promise cancel callback do not expect a Promise as result.
In order to handle potential errors triggered by setButtonTitle, run it in an renderjs's job.

See merge request nexedi/erp5!1285

We no longer run tests with `python setup.py`, but simply with `python -m unittest`

With nexedi/slapos!862 we no longer need this

See merge request nexedi/erp5!1316

See also https://github.com/zopefoundation/ZEO/pull/63
     and nexedi/erp5!1095

No error in testCMFActivity and testConflictResolution.
For the only error in testInvalidationBug, see comment.

But this commit is not enough for ZODB5. The only known issue so far
is the use of newer pickle protocol, which breaks export of ZODB data
and requires non-trivial changes in our XMLExportImport/ppml code.
So for the moment, many failures in testBusinessTempate.

erp5_web_renderjs_ui_test: reproduce validation error issue and add asserts to make sure field has expected class

* Trigger focus and blur to test renderjs functions properly
* Add asserts to make sure we don't lose value after raise Invalid Date
* Cover issue that invalid class does not disappear after click to create new object Foo in relation input
* Make sure fifth_failure input has invalid class
* Cover validation error to multicheckbox, checkbox and radio fields

* change the label field to not display the error text by default
* change all html5 fields (input, select, textarea) to add a custom *invalid* class when the field is invalid
* change all html5 fields to listen to the `focus` and `blur` event (with the renderjs onEvent method)
  Then, acquire (with `declareAcquiredMethod`) and call `notifyFocus` / `notifyBlur` methods respectively.
* change the label field to handle `notifyFocus` / `notifyBlur` (with `allowPublicAcquisition`).
  Change the validation error text display state depending on the field status
* Trigger onStateChange to set invalid class. If error comes from input field, we need to change state locally to set invalid class
* Regenerate gadget_erp5_nojqm.css from  erp5less.css using http://lesscss.org/less-preview/
* Textarea gadget should not prevent default when invalid event is triggered
* Support notifyFocus and notifyBlur in panel