2.7.5 released December 18, 1999

- elimination of stackp<depth contingency in break_chain2 call from defend2
- reordering of the nodes in break_chain2 for minor speedup
- minor cleanup in reading.c (elimination of unnecessary braces)
- bugfix in attack2
- bugfix in moyo.c
- minor tuning
- cleanup and revised trace messages in shapes.c
- old style C and B patterns taken out from patterns.db
- debug messages converted to trace messages in move_reasons.c