contrib-1.7.tar.gz available.

I forgot to include ./contrib in the version 1.7 snapshot.  I've added
it to *++-1.7.tar.gz packages, so if you have not upgraded to version
1.7 yet, you can ignore this message.

If you have already grabbed version 1.7, and would like the contrib
directory, which currently only contains Sage++ code from Argonne
(Andrew Mauer), I've made "contrib-1.7.tar.gz" available, which is
simply the missing directory.

If you would like to add your (well documented) code to the ./contrib
directory for future releases, please send mail to
sage-team@cica.indiana.edul.  We would like to include good examples
of pC++ or Sage++ codes.