* lisp/net/rcirc.el (rcirc-server-commands, rcirc-client-commands)

* lisp/net/rcirc.el (rcirc-server-commands, rcirc-client-commands)
(rcirc-completion-start): New variables.
(rcirc-nick-completions): Rename to rcirc-completions.
(rcirc-nick-completion-start-offset): Delete.
(rcirc-completion-at-point): New function for constructing
completion data for both nicks and irc commands.  Add to
completion-at-point-functions in rcirc mode.
(rcirc-complete): Rename from rcirc-nick-complete; use
rcirc-completion-at-point.
(defun-rcirc-command): Update rcirc-client-commands.