2.7.71 released April 12, 2000

- bugfixes in the hashing code, now CHECK_HASHING works again
- pattern database code restructured, explicit calls to compile_for_match()
  no longer needed
- apats.db renamed to mouse_attackpats.db and dpats.db renamed to
  mouse_defendpats.db 
- minor cleanup of dragon.c, life.c, optics.c, and patterns/patterns.h
- documentation of hashing added to doc/reading.texi
- cleanup of filllib.c