(rcirc-timeout-seconds): New variable.

(rcirc-timeout-seconds): New variable.
(rcirc-keepalive-seconds): Remove variable.
(rcirc-server-name, rcirc-timeout-timer, rcirc-connecting)
(rcirc-process, rcirc-user-disconnect): New variables.
(rcirc-connect): Initalize new variables.
(rcirc-keepalive): Don't send keepalive pings before connection is completed.
(rcirc-sentinel): Do mark all channels with activity when
connection is dropped.  Run hook with process buffer local.
(rcirc-reschedule-timeout, rcirc-delete-process): New functions.
(rcirc-buffer-process): Return value of rcirc-process if rcirc-server-buffer
is nil.
(rcirc-server-name): Return the reported server name.
(rcirc-update-prompt): Simplify computation of the server name.
(rcirc-format-response-string): Likewise.
(rcirc-handler-001): Mark server as connected, record the reported server name,
and schedule a timeout.
(rcirc-track-nick): Add a spec for the tty class.
(rcirc-user-non-nick): Remove function.
(rcirc-nick-prefix-chars): Add variable.
(rcirc-user-nick): Use above variable.