(plus some other minor cleanup).

thanks to QuickLisp (:-) for noticing the problem.

I left this fix on the floor a _long_ time ago. Now there's
a test for the problem.

fix bad dynamic-extent declaration in %handle-message

  reworked handle-message with the start of an idea from
  cl-log: added create-message-for-sender and a new
  basic-message-creator class. Handle-message takes the
  message and any other arguments and passes those on to
  the sender to create the message. The basic-message-creator
  calls `format` to convert the message into a string. Other
  options are possible. Hmmm, I hope this doesn't mean I'll
  need to call log5 log6?

  tweaked output to get rid of all those extraneous #\"s

  website tweaks

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