Include definition of all texture features

Software guide, doxygen

The documentation of all textures is spread in different documentation.

The "simple" texture formulas are available in the software guide:

The "advanced" texture formulas are available in the doxygen documentation of the class (see section detailed description):

The higher order formulas are also available in the doxygen;

Please put them all in the software guide (perhaps starting by the doxygen pages in the HaralickTextureExtraction application documentation