each service).
JS server.clients property is read-only (use client_add/remove to adjust value
in static services).
Increment service (and server) "clients served" counter for each call to
client_add() - solves problem of IRCD reporting "0 clients served" when
terminated.
Re-enabled debug output (for debug builds) in client_add/update/remove methods.
client_remove() method will no longer decrement the active clients total if
passed an invalid Socket object or socket descriptor.
Force static service client counters to 0 when terminated
(log a warning if non-zero) - solves the problem of waiting for ever for IRCD's
clients to disconnect (which has actually already happened).