[Yhc] Data.Map

[Christopher Lane Hinson]

I sent a patch to yhc at haskell.org, but triggered the moderation 
system for the message being too long.

The patch can be found by pulling from my alternate repo at 
http://www.downstairspeople.org/darcs/yhc_clanehin

Note that this repo is inconsistent with what it was yesterday, if you 
pulled from that, as though by unrecord.  So pull freshly if needed.

Please advise as needed.

--Lane