LJ::clear_rel — Deletes a relationship between two users or all relationships of a particular type for one user, on either side of the relationship.
LJ::clear_rel(dbs, userid, targetid, type);
dbs. Deprecated; optional, a master/slave set of database handles.
userid. source userid, or a user hash, or '*'
targetid. target userid, or a user hash, or '*'
type. type of the relationship