2.7.54 released March 23, 2000

- revised eye patterns, prefer to play on marginal vital points
- doc revision
- introduction moved from incremental.c to texinfo
- special value 99 implemented for apats and dpats
- new apats and dpats
- AUTHORS and doc/introduction.texi revised
- accurate_countlib revised
- slow_findlib() added in incremental_board.c so that
  incremental_findlib() and incremental_countlib() can handle all cases