The results of some modifiers are not reproducible with the default tolerance threshold. With this change, the regression test frameworks for modifiers can cover more modifiers that need a larger tolerance.
Don't abbreviate, use threshold.
rename thresh -> threshold in Python API
Thanks Brecht. Could you commit the change? I don't have commit access...
Thanks, committed rB6e4eb2be283606a8cea45904ab57584dc07d1e05