TkLogHandler also gets slower over time, since it creates
lots and lots of buttons (I think that's the reason, at least).

Drew asks for more filtering mechanisms: filter levels by
clicking the level names in the text, and filter channels by
clicking the channel names in the text.

I wish the status on these things wouldn't jump back to
chatting all the time.

TkLogHandler is working great for our purposes and I'm not
sure how much syntax highlighting is needed.

--> lower priority

"Done and done.  And I mean done!"  Syntax highlighting will
be done later, I guess.

I'd be more comfortable using the logging package if I knew
that I had a nice way to view the output.  We need to put
them all in a big Tk.Text widget, tagging each line with the
channel.  Then, some toggle buttons at the bottom will turn
on  and off channels.  Syntax highlighting via regexes
should be an option too.  Finally, this should be a separate
module, usable by programs other than Hiss.