Revert "Merge branch 'bugfix/fix-nonsimplex-quad-order' into 'master'"

This reverts merge request !113 (merged). I should have been more careful: Since the quadrature order is chosen to be fe.localBasis().order()*dim, the true polynomial order is chosen anyway. Thus using -1 for the derivative is OK, even for non-simplex geometries.

On the other hand the order is often to high. To avoid this one should remove the ...*dim and re-add the patch from !113 (merged). But since this reduces the order it should be carefully discussed.