[multi-sources-removal] drop repository entities_modified_since public api
actually only used by pyrorql/zmqrql sources which have been dropped.
This will allow to drop a bunch of system meta-data (eg deleted_entities)
Related to #2919300
.. -*- coding: utf-8 -*-
Dernières modifications
-----------------------
* la table des `derniers changements`_ fournit un exemple d'utilisation de RQL
pour récupérer les derniers changements ayant eu lieu sur ce site.
.. _`derniers changements`: view?rql=Any+M%2CX+WHERE+X+modification_date+M+ORDERBY+M+DESC+LIMIT+30