OTHER: Deprecate medialib_entry_changed in favor of _updated in perl clientlib.

The _changed function will be changed to unify _added, _updated,
_removed after release.
OTHER: Deprecate broadcastEntryChanged in favor of Updated.

The Changed function will be changed to unify Added, Updated,
Removed after release.
OTHER: Add missing 'universe' collection type to perl clientlib.
OTHER: Let python embed the method signatures.