[repo] more efficient eid cache operations handling based on set_operation; refactor
* split CleanupEidTypeCache operation into one operation for deleted eids
and another for added eids, and put them in cw.server.hook
* for consistency, move fti unindexing handling from the repository
to the system source
* handling of deleted eids is done in plan execution (ssplanner), no
needs to redo it in *delete_info
-> no more need for _prepare_delete_info method, killed
"""pre 3.6 bw compat"""
# pylint: disable-msg=W0614,W0401
from warnings import warn
warn('moved to cubicweb.mttransforms', DeprecationWarning, stacklevel=2)
from cubicweb.mttransforms import *