Simple proof-of-concept hack for early cutoff
Fix crash if roleout requested in terminal state
#164 Added depth-based sample weight decay, auto-tuned based on observed game length stats
Also fixed a bug that caused positiv selection scores to occur for complete losses in sufficiently long games
#165 Fix forced-loss testign to be symmetrical between factors
Temporary experimental changs
Code tidy up + assessment of goals stability and use of that information in tuning use of weight decay