2.5.13 released September 29, 1999

- reading code tries to attack strings with 4 liberties
- new function savestone4
- help string: options --depth etc. are not debug options as they
  affect playing strength so these are in main help string now
- bugfix in dragon_status: dragons rescued by ko are not DEAD
- continued cleaning of moyo.c
- one new pattern in eyes.db