2.7.159 released August 30, 2000

- mouse tuning
- tuning
- new files jahy.sgf and reading07.sgf in regression/games/
- new tests
- Wolfgang Manner's hoshi.sgf
- missing include added to cache.c
- fuseki database turned on by default; option --fusekidb replaced by
  option --nofusekidb
- new option --nojosekidb to turn off joseki database
- simplified code in defend1() and defend2()
- new macros UPDATE_SAVED_KO_RESULT() and
  UPDATE_SAVED_KO_RESULT_UNREVERSED() in reading.c to simplify keeping
  track of moves leading to ko
- better handling of ko results in various reading.c functions