about an overflow with eg 'STATS maxperip' (IRCOp-only command).
Also, STATS maxperip failed to return 1 in the hook, resulting in
unnecessary STATS help output after the list.
Also fix documentation for ~10 hooks to mention the hook name.
Obviously, the maxperip module is loaded by default (in modules.default.conf)
but it is nice to have the 400+ lines contained in a separate module
rather than being in the nick module that does NICK/UID handling.
Will look at moving more later..