Option to Plot plane normals in Pole figures

Option to plot direction (Currently) or plane normals designated at the plane {HKL}. This is redundant in cubic systems but quite useful in the non-cubic systems. A great example is in tin which is tetragonal. The directions are no longer normal to the planes (except in certain specific cases). For example the direction is nearly normal to the {331} plane. Thus the pole figure and the {331} pole figure look the same but one has to know this to be able to plot the correct figures. It would be nice to be able to plot directions or plane normal.