(rcirc-connect): Make all arguments optional, and default to global variable
values for unsupplied args.
(rcirc-get-buffer-create): Fix bug with setting the target.
(rcirc-any-buffer): Rename from rcirc-get-any-buffer, and include test for
rcirc-always-use-server-buffer-flag here.
(rcirc-response-formats): Add %N, which is a facified nick. %n uses the
default face. Change the ACTION format string. If the "nick" is the server,
don't print anything for that field. Comment fixes.
(rcirc-target-buffer): Don't test rcirc-always-use-server-buffer-flag here.
(rcirc-print): Squeeze extra spaces out of the text before message.
(rcirc-put-nick-channel): Strip potential "@" char from nick before adding
them to nick table.
(rcirc-url-regexp): Improve to match address like "foo.com".