Fix (new) flake8 errors They showed up on upgrade of flake8/pep8.

[pyramid] Try "eid" first when retrieving a subresource of ETypeResource So that Pyramid traversal works as existing CubicWeb URL publishing.

Fix AttributeError on postcommit when db-create adds non-system CWSource entities In this case, `Repository.add_source` is called from an operation, not from `Repository.init_sources_from_database`, thus the attribute `sources_by_eid` does not exist. Closes #16251078.

[devctl] Optimize cleanup_sys_modules a bit by moving out of a loop a costly computation that is constant. This at least benefits the `i18ncube` command. Related to #15789486.

[pyramid] Install file listing monitored files in application home Instead of using a temporary file, that never gets deleted. Closes #16159807.

[pyramid] Fix login error message language Use http negotiation unless language is explicitly set for the site. Closes #16236485.

i18n update Pyramid-related messages were not translated. Closes #16236243.

[pyramid] Add action verb used in some messages displayed by the command For instance we'll see 'instance started' instead of 'instance None', which is nicer.

[pyramid] No more need to check CW version since it's now shipped with it

[pyramid] Fix 404 handling Avoid seeing a traceback in the UI by catching it before it reaches pyramid and restore usage of the '404' view. Closes #16159863

Fix broken flake8 configuration and flake8 errors which were hidden by this breakage. flake8 --filename options doesn't work as expected: * it's expected to be a shell pattern, using stdlib's fnmatch.fnmatch function internally. This funciton thinks that 'cubicweb/x.py' doesn't match 'cubicweb/x.py' (there must be a reason but that's not the point), hence no file was actually checked ; * as this is a list of pattern, each encountered file is checked against each pattern, leading to run time explosion. So maintain list of files to check in a separated file and give this list to flake8 using unix's xarg command.

[entities] Fix typo in wfobjs debug message

[doc] Add my 3.24 release notes

[migration] Drop cw_schema relation first without this, we ends up with the traceback shown at https://www.cubicweb.org/ticket/16130960. This is not the proper fix, which I have not been able to find. It seems due to this very rare case of deletion of such relation linked to CWRType vs order of execution of operation (in this case, the operation deleting the entity table is run before some other queries using it). As forcing this relation to be deleted before the entity type fixes the problem while this case seems rare enough, IMO this patch is "good enough". Closes #16130960

[hooks] Delete some properties cached on entities schema on schema updates cubicweb.schema add two additional @cachedproperty that should be cleared when in-memory schema is modified. This may leads to e.g. attempt to delete some already dropped relations. Related to #16130960

[doc] Add some words in changelog about pyramid support in core + fix its title Closes #16121152.