[views/boxes] re-establish the proper selector (closes #2496294)

[ldapparser] raise specific error if the configuration is wrong (closes #2498164)

[skeleton] add pypi classifiers in __pkginfo__ and setup.py (closes #2502156)

[c-c shell -H] add verbosity=0 so we are not asked to confirm everything, as when not using -H

mock ``CWUser.prefered_language()`` on InternalManager objects. The recent split of patches for session refactoring broke this.

[session] fix arguments default value and promote usage of security_enabled as session method. Closes #2481820 One should use session method rather than direct usage of the context manager of the same name. Fix default argument values for consistency with the context manager: when one omit an argument, meaning is "keep the current value", not "disable security".

[session] promote usage of [deny|all]_all_hooks_but session methods rather than hooks_control context manager directly

[web app] move set of status_out into validation_error_handler to ease readability

[workflow test] don't use session.user, subject to internal changes

[db creation test] more testing of db initialization: call build_db_cache and ensure admin user exists