[hooks/syncschema] Turn DropColumnOp into a data operation While writing a test for a migration issue where "NOT NULL" was added to an inlined relation column, I ran into a case where the same column was deleted twice, which of course results in an error. This is because the "ecrit_par" relation used by the test is ambiguous. I've hence turned the DropColumnOp into a data operation to ensure we'll delete the column only once in such case. Related to #6211101

[server/sources] fix name error in eid_type_source_pre_131 i.e. the eid_type_source implementation used when some pre 3.13.1 database is detected. Regression from 5fbdbbe51867.

[repository] deprecate the extid2eid based multi-sources API This API is cumbersome and lead to obfuscated code because of the callback mecanism implied when some entity has to be created. Since we dropped the "true" multi-source, this mecanism is not needed anymore and one should prefer to use the dataimport API inside its parser instead. Notice the cwxml parser will trigger the deprecation warning, it should not be used anymore in favor of ad-hoc parsers.

[ldapfeed] use source's extid2eid, the repo's one will be deprecated in a near future.

[ldapfeed / dataimport] port ldapfeed parser to dataimport API This makes the code easier to understand and will allow to deprecate the old multi-sources api, based on creation callback through repo.extid2eid. Currently with this patch, modification dates are not checked, hence entities will be systematically updated. We run the import with no hooks, because RQLObjectStore can only add entities to the system source.

[server/test] document expected packages to run ldap tests

[ldapfeed] simplify ldap2attrs * tdict argument is never given * separate value retrieval from setting output (will ease a latter cset)

[ldapfeed] simplify deactivation of unencountered users there is no need for the by_etype intermediary dictionnary since we only consider CWUsers.

[server/test] display rset content on failure

Remove trailing empty lines Makes pep8 happier

[ldapparser] simplify extid splitting

[test/ldap] a bit of pep8