Suppress undo file writes during a script

[Bruno Kestemont]

I have Windows crashes when the heating is too high. May be the new function would help solving this problem.

[Bruno Kestemont]

I hope it doesn't affect the "recent best" commands (hopefully not) neither the remix attempts.

[Bruno Kestemont]

Implemented here in this gab bis recipe:
http://fold.it/portal/recipe/102015

[inkycatz]

Appears to be resolved, please reopen if there are further issues on this.