2.7.138 released July 21, 2000

- bugfix in regression/regress.sh, VPATH build was broken
- new function special_attack2() containing code broken out of attack2()
- new function special_rescue2() containing code broken out of defend2()
- more functions use order_moves()
- all reading functions use the same parameter names (attacked/defended
  string is (si, sj)). 
- new debug bit DEBUG_MOUSE_PERFORMANCE
- new debug outputs in mouse.c
- bugfix in mouse_does_defend() and mouse_connection_defends()
- new struct dragon_data2 in liberty.h
- new static function compute_supplementary_dragon_data() in dragon.c