2.7.160 released August 31, 2000

- one new pattern in mouse_defendpats.db
- hoshi.sgf revised
- improved ko awareness in reading.c
- loop ununrolled in attack2()
- SGFTRACE calls added to break_chain(), break_chain2(), break_chain3(),
  and relative_break_chain()
- reading functions consistently return an illegal ko capture rather than
  pass if it is the best way to win
- bugfix in gtp_genmove_black() and gtp_genmove_white()
- new files reading08.sgf and reading09.sgf in regression/games/
- new reading tests