[repository] Drop the entities.extid column and associated cache This was not necessary anymore with promoted usage of the new data import API. Turn repository's _type_extid_cache to _type_cache with only the entity's type as key. This introduces an backward incompatible change: entity_metas dict doesn't contains anymore the extid key, but it doesn't seem used at all anywhere, so this sounds acceptable. Closes #15538317

[repository] Drop the entities.asource column It not used anymore thanks to previous patches. Closes #15538288

[integrity check] Stop using entities.asource column in integrity checks Simply check if entities have a cw_source, and link it to the system source when not found. Related to #15538288

[rql2sql/test] Ensure test results predictability Without this, test were randomly failing within tox due to different order of solutions.

[rql2sql] Stop generating SQL query from RQL using entities.type This was necessary in the "true multi-sources" time, it's not anymore, while maintaining this index is costly. Related to #15538317

[test] Remove some usages of lgc.testlib

[test] Avoid pytest discovery warnings Having TestServerConfiguration and alike in the test module namespace causes pytest discovery errors, because it thinks it's a test class.

flake8 and all * update some copyright * drop most __docformat__ declaration * fix some flake8 warnings / errors

[schema2sql] Drop deprecated comment

[cnx] Use entity_type instead of entity_metas()['type'] The latter is deprecated in favor of the former which has been introduced on cnx to replace it.

[entity] Reimplement and deprecate entity.cw_metainformation It shouldn't rely anymore on cnx.entity_metas which is itself deprecated, and the cw_metainformation API is similarly not needed anymore, access directly to cwuri / cw_source if needed. Related to #15538288

[repository] Drop type_and_source_from_eid and rename related cache We don't want to handle anymore the entities.asource column so we shouldn't use those anymore. Also rename repository's _type_source_cache into _type_extid_cache as this is what it's containing now. Do similar renaming to the system source API. Related to #15538288

[entity] Stop returning source information in cw_metainformation() We should not need that. It has been introduced to handle things we should not do and probably don't do anymore (e.g. attempting to grasp recursive import of several sites). Related to #15538288.

[json] Stop serializing cw_source into default json representation of an entity Related to #15538288

Drop deprecated LDAP related script both are relying on the 'entities.source' column which has been dropped in 3.19. They have been written with the old ldapsource in mind, which has been dropped at that time.

[entity] Stop linking to external site for external entities This behaviour was ok when we had "true" multi-sources but its rather painful with datafeed sources. Also, it makes absolute_url() costlier than what it should. Besides, it relies on cw_metainformation()['source'] that is pending for removal. Instead, add a link to the original object in the metadata view (the one that displays eid and source at the bottom right corner of the primary view). Related to #15538288.

[datafeed] Drop entity deletion handling in the default source / parser This should be handled by specific parser to avoid using "entities.asource". Reimplement it in the ldap parser. Related to #15538288

[sources] Drop 'moved_entities' table handling This was clumsy and could be handled using exturi / cwsource, as the ldap source now does.

[repository] Drop deprecated extid2eid API and friends This will break cwxmlparser based sources. They should be rewritten using a specific parser, based on xml representation or on rqlio. This is harsh but allows a so big cleanup of the code base. Furthermore, it's necessary for asource/extid handling in the entities table which is costly for most app that don't care at all about that... In this cset, delete: * all extid2eid methods * repo._extid_cache handling * [before/after]_entity_insertion source callback * the cwxmlparser and update related tests, notably unittest_datafeed where 'repull' testing has been removed, since it's now handled by the dataimport API and should not be retested there. Related to #15538288 Closes #15538383

[ldap] Stop using entities table in ldap source authentication and parser We may used cwuri for the same purpose, and do one more step towards deletion of entities.extid column. Related to #15538288

[test] Use stdlib unittest in unittest_webconfig.py

[tox] Require ldap3 < 2 for server tests Apparently we are using some constants that got dropped/moved in ldap3 >= 2.0.0 (which came out last week). So stay with version 1.4 until this gets sorted out.

[setup] fix CWDevelop to keep compat with python 2.7 in Python, 2.7, setuptools.command.develop.develop is an old style class, thus it cannot be called with super.

[devtools] Make dependency on backports.tempfile (Python2) optional The package may not be available in all systems (e.g. no Debian package exist at the moment), and we should not crash with ImportError when importing testlib from client code. Follow up on a6dc650bc230 where the dependency was introduced.

[sources] Drop source support_entity / support_relation source API this was used in the pre-datafeed area, it's not worth it anymore. Its only valid usage was in authentication to detect if the source was supporting CWUser, hence we now call it systematically and catch NotImplementedError.

[dataimport] Add a new NullStore This is useful to do some import tests where you only want to test steps prior to the database insertion, as well as "dry-run" commands. Use it as a documenting base class.

[devtools] Properly reraise the exception with previous implementation, the original exception wasn't visible in python 2.

[pkg] Do not install sql scripts in <prefix>/share/cubicweb/schemas These are already site-packages along with cubicweb package.