GNU Go 3.1.17 releasd December 16, 2001

The CVS tag is rel-3-1-17. The following patches are included.

semeai_1_17.2.  Semeai revisions. 
gunnar_1_17.9   Cleanup. 
trevor_1_17.11. Tuning and more. 
trevor_1_17.10. New test suite. 
gunnar_1_17.8.  Tuning. 
teun_1_17.2.    Bugfix in patterns/Makefile.am. 
gunnar_1_17.7.  naive_ladder() replaced by simple_ladder(). 
gunnar_1_17.6.  Bugfix. 
gunnar_1_17.5.  Optics patch. 
trevor_1_17.8.  New test case. 
trevor_1_17.9.  Mostly tuning. 
bugfix_1_17.1.  Two bug fixes. Supercedes teun_1_17.1. 
gunnar_1_17.4.  Readconnect revised. 
trevor_1_17.7.  removed small value lunch attacks and defends from owl.c. 
trevor_1_17.6.  Test revisions. 
optics_1_17.1.  prevents linear_eye_space from returning occupied vital points.
trevor_1_17.5.  Tuning and more. 
gunnar_1_17.3.  Readconnect revised. 
gunnar_1_17.2.  Readconnect revised and new test cases. 
trevor_1_17.2.  Test revisions. 
trevor_1_17.3.  Break through helper revised and other changes. 
trevor_1_17.4.  Tuning. 
trevor_1_17.1.  adds experimental stuff to config.vcin and config.vc. 
gunnar_1_17.1.  Readconnect revised. 

- new configure and runtime options semeai-variations
- new function semeai_trymove()
- bugfix in catalog_goal
- semeai revisions
- warning avoided in dfa_avoid_string()
- code cleanup
- devalued attacking dead group bonus
- corrected value to final_value in review_move_reasons()
- value_territory() in influence.c revised
- common debug code moved from compute_eyes(), compute_eyes_pessimistic() 
  to print_eyes()
- inactive support to test against linear_eyes() in compute_eyes_pessimistic()
- MAXPATNO increased to 400 in mkeyes.c
- naive_ladder() replaced by simple_ladder()
- bugfixes in attack_threats()
- new gtp commands reset_connection_node_counter, get_connection_node_counter
- removed small valued lunch attacks and defenses in owl_determine_life()
- new gtp commands owl_threaten_attack, owl_threaten_defense
- better error reporting in mkpat.c
- improved error reporting in owl.c
- html regression view tweeks
- new function second_order_liberty_of_string() in board.c
- readconnect.c revised
- take into account followup values if reverse_followup >= 1
- try a little harder in attack_either
- break_through_helper improved.
- tuning
- owl tuning
- eye tuning, adding many patterns with occupied margins
- test revisions