kes Remove a few malloc()s from the encryption code.

kes  Use the class calls to bsock in filed/backup.c and restore.c in
     place of the old bnet_xxx code.
kes  Implement code that does an on the fly calculation of the
     signing digest during restore of encrypted files.  It makes
     a best guess at the algorithm, and if it is not correct, will
     then revert to the old code which reads the file after it is
     restored.
kes  Implement at least one missing crypto stream in stream_to_ascii()
kes  Apply patch from William <chowmeined@gmail.com> that fixes bug
     #877 where a reload with bad syntax causes Dir to exit.