"External Web Page" does not exist and this form is not referenced

This is required to be able to name forms SmartAssistant_viewSomething

and also add a field in left group

required to be able to name forms SpreadsheetConfiguratorItem_view

Solver Type only exists in erp5_simulation it does not make sense to have
forms for solver types in base.

This was no longer used and replaced by Entity_addEventDialog since
fbd062eb (Allow creation of events from any document, 2011-02-25)

The spec says "see _getTypeBaseMethod" and _getTypeBaseMethod walks the
portal type class mro, which contain property sheets.

Probably we should be using interfaces instead, let's do this simple way
first and we'll improve later.

For most of theses, we can not change without risking to break
compatibility. Some of them are misnamed legacy fields library or some
forms that still needs to be updated to use field libraries.

Checking some conventions for form, dialog and reports based on
https://www.erp5.com/documentation/developer/guideline/programming/
and https://www.erp5.com/documentation/developer/guideline/module/

For now we implement only a few checks, we will extend later.

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.