Inversion Handling Toggle In PbdModelConfig
Currently you have to loop through all the constraints separately after start to disable inversion handling. It would be better if the flag existed in PbdModelConfig, was given to the PbdFemTetConstraintFunctor and set when the PbdFemTetConstraints are created.
ie: There is no way to tell it to generate PbdFemTetConstraints that don't handle inversions from the start.