New check_register_user hook in ejabberd_auth.erl
to allow blocking account registration when a tombstone exists.
Modified room_destroyed hook in mod_muc_room.erl
Until now the hook passed as arguments: LServer, Room, Host.
Now it passes: LServer, Room, Host, Persistent
That new Persistent argument passes the room persistent option,
required by mod_tombstones because only persistent rooms should generate
a tombstone, temporary ones should not.
And the persistent option should not be completely overwritten, as we must
still known its real value even when room is being destroyed.
mod_tombstones is available in experimental mode in ejabberd-contrib git.
Initial feature request: #2546
Badlop
71ad7c368d