[Bug-gnubg] Errors tagging in analysis

[Philippe Michel]

Currently, in GNUbg analysis, bad moves or cube decisions are tagged 
doubtful, bad or very bad when they lose 0.04, 0.08 or 0.16 point. These 
are default values and can be changed in the Settings/Analysis panel.

Looking at recent discussions in online forums (recent being in the last 
few years, not *very* recent), it seems the generally accepted 
thresholds are now somewhat lower. Moves wrong by 0.02-0.03 deserve 
consideration, 0.10 is a serious blunder, something like that.

Would anyone mind if these default values were cut by 1/4, to 0.03, 0.06 
and 0.12 ?