Automatic matrix corrections

[Roland Melkert]

Brilliant, using the cross product just like with normals that's a much nicer approach then just tossing in a '1' somewhere.

I'm going to change it so if ether (exactly) one row or col is all zero's it fills it with the crossproduct of the other two rows/cols.

That should take care of most, if not all, det==0 problems.

Thank you very much.