[migration] more rename_entity_type fix
* ensure repository caches and system tables are properly cleanup
* delete relations from/to entities deleted through sql
So we don't ends up with a corrupted db...
usr/lib/python2.4/site-packages/cubicweb/
etc/init.d
etc/cubicweb.d
etc/bash_completion.d
usr/bin
usr/share/doc/cubicweb-ctl
var/run/cubicweb
var/log/cubicweb
var/lib/cubicweb/backup
var/lib/cubicweb/instances