Use of standard score counting way for 2 players
TimeKeeper can now be used outside pure tests
Use TimeKeeper to measure AI speed
Minor: comment and log
Allow more than 1 AI in console mode too
New Hunter added, renamed Killer, merged AvoidBorders
Fix: kill while merging + undo

Added test
No more debug AI by default
Named test parameter correctly (test_name)
Slightly better reaction to error in parsing
Separate log flag $debug_group
2 new methods + new log flag $debug_group
Keep and log the 2nd best scores (even if found later)
New hunter heuristic + test, better Spacer

(merged AvoidBorders idea into Spacer, its real place, since the 2
notions only make sense together)
Separate log flag
Some refact + "empty?" method
Minor refact
New heuristic "Connector" + Savior uses a hunter!
switch_side method to use a "consultant heuristic"
New Connector heuristic