[vtkusers] vtk nightly problem ... solved (relevant for 312 users)

[joris 2]

I wanted to use the vtk nightly for it's standard library support. After some 
compilation troubles my program ran again but gave erronous results.

After a couple of days of debugging I found the problem.

Before, I noticed that vtkMath::InvertMatrix() did not give the inverse but 
transpose inverse and adjusted my code accordingly.

With the nightly, vtkMath::InvertMatrix() does what it should and I had to 
remove the tranposision I did.

Joris