ENH: remove Vahine code

Code/Vahine/CMakeLists.txt

Code/Vahine/COPYING

Code/Vahine/CenteringImageFilter.h

Code/Vahine/CenteringImageFilter.txx

Code/Vahine/CovPixelSelectFilter.h

Code/Vahine/CovPixelSelectFilter.txx

Code/Vahine/ElmVcaFilter.h

Code/Vahine/ElmVcaFilter.txx

Code/Vahine/FlatReshapeFilter.h

Code/Vahine/FlatReshapeFilter.txx

Code/Vahine/GrsirFilter.h

Code/Vahine/GrsirFilter.txx

Code/Vahine/GrsirInverseFilter.h

Code/Vahine/GrsirInverseFilter.txx

Code/Vahine/GrsirLearningFilter.h

Code/Vahine/GrsirLearningFilter.txx

Code/Vahine/InverseFilter.h

Code/Vahine/InverseFilter.txx

Code/Vahine/LICENCE

Code/Vahine/MaskUpdateFilter.h