Patch by Jose Geraldo Brito

Patch by Jose Geraldo Brito
Tracker 31061
It cures the stiff quad option and does not seem to harm.
Nowever the stiff quads behave strange in a ngom mesh.
I can imagine that other parts in the sofybody module may be broken by the ngon structure. Well ngons and softbodies are not relly friends:
negon wants less edges softbodies would work better if more structural edges were possible