Bill Lorensen authored Mar 06, 2015 and Will Schroeder committed Sep 11, 2015

Some Mac compilers fail to compile member function calls with the
redundant prefix:
vtkFlyingEdges2DAlgorithm<T>:: and vtkFlyingEdges3DAlgorithm<T>::.

Removing (the redundant) prefix resolves the compilation issues and
seems to be portable.

Also replaced static const unsigned char with enums. Some Macs had
trouble resolving the static consts at link time.