LJ::modify_caps — Given a list of caps to add and caps to remove, updates a user's caps
LJ::modify_caps
(uuid, cap_add, cap_del, res);
uuid.
cap_add.
cap_del.
res.
cgi-bin/ljlib.pl
updated u object, retrieved from $dbh, then 'caps' key modified otherwise, returns 0 unless all hooks run properly