(rcirc-format-response-string): Use rcirc-nick-syntax

(rcirc-format-response-string): Use rcirc-nick-syntax
around bright and dim regexps. Make sure bright and dim matches
use word anchors.  Send text through rcirc-markup functions.
(rcirc-url-regexp): Add single quote character.
(rcirc-connect): Write logs to disk on auto-save-hook.
Make server a non-optional argument.
(rcirc-log-alist): New variable.
(rcirc-log-directory): Make customizable.
(rcirc-log-flag): New customizable variable.
(rcirc-log): New function.
(rcirc-print): Use above function.
(rcirc-log-write): New function.
(rcirc-generate-new-buffer-name): Strip text properties.
(rcirc-switch-to-buffer-function): Remove variable.
(rcirc-last-non-irc-buffer): Remove variable.
(rcirc-non-irc-buffer): Add function.
(rcirc-next-active-buffer): Use above function.
(rcirc-keepalive): Send KEEPALIVE ctcp instead of a PING.
(rcirc-handler-ctcp-KEEPALIVE): Add handler.
(rcirc-handler-CTCP): Don't print KEEPALIVE responses.
(rcirc-omit-mode): Add minor-mode.
(rcirc-mode-map): Change C-c C-o binding.
(rcirc-mode): Clear mode-line-process. Use a custom
fill-paragraph-function.  Set up buffer-invisibility-spec.
(rcirc-response-formats): Remove timestamp code.
(rcirc-omit-responses): Add variable.
(rcirc-print): Don't put the overlay arrow on potentially omitted
lines.  Log line to disk.  Record activity for private messages
from /dim nicks.  Facify the fill-prefix with rcirc-timestamp face.
(rcirc-jump-to-first-unread-line): Print message if there is no
unread text.
(rcirc-clear-unread): New function.
(rcirc-markup-text-functions): Add variable.
(rcirc-markup-timestamp, rcirc-markup-fill): Add functions.
(rcirc-debug): Don't mess with window configuration.
(rcirc-send-message): Send message before printing locally.
Add SILENT argument, do not print message if non-nil.
(rcirc-visible-buffers): New function and variable.
(rcirc-window-configuration-change-1): Add function.
(rcirc-target-buffer): Make sure ACTIONs don't get sent to the
server buffer.
(rcirc-clean-up-buffer): Set rcirc-target to nil when finished.
(rcirc-fill-paragraph): Add function.
(rcirc-record-activity, rcirc-window-configuration-change-1):
Only update the activity string if it has actually changed.
(rcirc-update-activity-string): Remove padding characters from the
mode-line string.
(rcirc-disconnect-buffer): New function to be called when a
channel is parted or the user quits.
(rcirc-server-name): Warn when the server-name hasn't been set.
(rcirc-window-configuration-change): Postpone work until
post-command-hook.
(rcirc-window-configuration-change-1): Update mode-line and
overlay arrows here.
(rcirc-authenticate): Fix chanserv identification.
(rcirc-default-server): Remove variable.
(rcirc): Connect according to rcirc-connections.
(rcirc-connections): Add variable.
(rcirc-startup-channels-alist): Remove variable.
(rcirc-startup-channels): Remove function.