Added Channel URL (IRC 328) and JoinNotice for channels.  Controls added to UI.
web ui: Channel topic changed to a textarea.
web ui: Channels tab needs a "Refresh" link, like users has.
web ui: when saving changes (example: settings tab), scroll to top when complete.
web ui: add new channel: focus on channel id text field on load
web ui: misc tweaks with pages deactivating and activating, eliminated some blinks.
web ui: now scrolling window to top when things are saved (settings, etc.).