[cwctl] make cwctl not depends on cubicweb.wsgi (closes #12210063) cubicweb.wsgi may not be available at all on Debian.

[hooks/workflow] pass eids, not entities, from hooks to operations Passing entity objects around runs the risk of getting out of date data from caches.

[web/httpcache] fix Last-Modified generation time.mktime takes a time tuple in *local* time. We have an UTC datetime coming from the last_modified method, which we were interpreting as local time, leading to hilarity. Use calendar.timegm instead. Add tests for Last-Modified generation of the 'download' and 'manage' views.

[forms] Fix edition of TZDatetime attributes Parse the submitted web form values into a timezone-aware datetime (by default, UTC) when such an attribute is edited. This is done using an automatically-selected (by `web.formfield.guess_field`) field named `TZDatetimeField`. Closes #12666598.

[doc] fix abstract and example of data import

[doc] fix abstract of data import

[repository] drop remanescence of old multi-sources code we don't use anymore this inputmap/varmap thing.

Added tag 3.20.15, debian/3.20.15-1, centos/3.20.15-1 for changeset 636a83e65870

[pkg] 3.20.15

[views] do not eat the self._cw.message in LogFormView (closes #12421177) accessing self._cw.message now(?) eat the message, so don't call "self._cw.message" twice.

[server] make InternalManager.name() return an empty string (closes #12418708) Otherwise the notification emails sent via an internal_session never honor the EMAIL.sender-name configuration option.

[test/migractions] work around drop_cube not deleting final etypes Closes #10096736

[hooks] deleting a final entity type shouldn't try dropping an sql table

[tox] Use a revision on proper branch for Yams "default" is not good when some bug fix release suddenly comes out...

[webconfig] disable generate-staticdir by default Its side effects mean it can be inconvenient, and using it requires manual (web server) config changes anyway, so there's no reason it needs to be enabled by default.