LJ::send_comm_invite — Sends an invitation to a user to join a community with the passed abilities.
LJ::send_comm_invite(uuserid, cuserid, muserid, attrs);
uuserid. a userid or u object of the user to invite
cuserid. a userid or u object of the community to invite the user to
muserid. a userid or u object of the maintainer doing the inviting
attrs. a hashref of abilities this user should have (e.g. member, post, unmoderated, ...)
1 for success, undef if failure