Version 1.711, 10/28/89. (Can't wait for 1.7111, 1.71111111, ... :-) )

Put in new copyright notice and warranty.

Version 1.71, 9/27/89.

squeeze and unsqueeze now complain about being given a filename.
Added sqz, sqzdir, unsqz, unsqzdir, mwcat.

Version 1.7.
