Allow edition in the new UI

This make everything slow as hell and prevent to quickly save.

Example: <h2 class="foo">bar</h2> => <h3 class="foo">bar</h3>

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.