Added missing modMucMamForwarded metric.
Updated order of handler from ejabberd_metrics_hooks for mam_muc_lookup_messages.
Added new book filter_local_packet. Fixed {badarg,[{ets,member,['ejabberd_users_muc.localhost',{<<alicesroom>>,<<muc.localhost>>}],[]} during sending a MUC message.
Added a special version of mod_mam_cache_user for MUC.

Added an empty stop_server function.
Added mod_mam_odbc_server_user: archive id assignor for multiple hosts.
Added unique constraint for mam_user and mam_server_user tables.
Deleted MAM_ARCHIVE_PRESENCE. Splited is_complete_message into several ones.
Fixed wrong function name.
Added mod_mam_muc_ca_arch:select_worker/2.
Merge branch 'arc-mam-mods' into arc-mam-ca
Added mod_mam_muc_ca_arch:prepare_room_id/1.
Added servers config variable for mod_mam_muc_ca_arch.