New system installed

[Moon at MIT-AI (David A. Moon)]

System 17.6, which has been installed on all machines except the ones in 902,
should be relatively free of bugs.  Note that there have been some minor
incompatible changes in the window system; if you have window-oriented code
that doesn't work any more, and you can't figure out how to fix it, consult
RMS or me or MMcM.  The main changes involved blinkers.

If you find it necessary to de-install this system on some machine, be certain
to send mail to bug-lispm explaining what was wrong with it.

This system will be installed in 2 or 3 days on the machines in 902 unless
there are complaints.