[server/test] Add an assertion in test_statement_timeout

[datafeed] minor cleanups to cwxml parser

[datafeed] don't allow arbitrary kwargs on DatafeedParser initializer else they will be handled nicely by appobject base class, while we rather want an error in the case of a source parser (arguable).

[datafeed] gives information about moved entities to the parser Also, don't support anymore arbitrary parameters at parser initialization. Related to #5414754

[datafeed] simplify SQL query used to retrieve information about entities from an external source no need to join on cw_source

[datafeed] rename parser.sourceuris to source_uris Its more readable. Also, uniformize related method and local identifier names.

[datafeed] move process_urls to the parser

[tox] Use py.test to run tests In unittest_rqlrewrite.py and repotest.py, rename utility functions so that they are not considered as "test functions" by py.test.

[test] Fix devtools unittest_i18n when ran without pytest There is currently some weird error, requiring both to hack cubicweb.__path__ and to stop using load_module_from_name to load the registry. Introduce a dependency on to-be-released version of logilab common integrating fix for https://www.logilab.org/ticket/6085650 Do some extra import cleanups along the way.

[server] explicitly set postgres LC_MESSAGES variable to C on connection We parse some error messages so we need them to be in English. It's not clear to me exactly when that's not the case, but this fixes running unittest_postgres' "test_constraint_validationerror" with py.test for Sylvain.

[web] cleanup xmlrss view Don't trigger exceptions unnecessarily, and add line breaks to the output.

[migration] add rollback when replace_eid_sequence_with_eid_numrange fails If we get here, the current transaction is aborted, so if we are to assume everything is fine and continue we need to rollback first.

[migration] move CWComputedRType later The ordering in this file is a mess, and things don't actually work this way (when upgrading from 3.17).

docstring fix

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pass eids, not entities, from hooks to operations Passing entity objects around runs the risk of getting out of date data from caches.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