fixed code sucht that it works with new indexing approach such that we now can load huge images
minor matlab changes
first version of taylor series based fragment diffraction shader
some necessary code cleanup for testFrag diffraction shader, also find a proper scaling apporach and furthermore check it again - dont forget about specular part even though there will be the gaussion weighting kernel approach which will automaticall take care of that issue.
found a bug for fresnel F which can cause in ceratin cases some singularities (=> NAN). Furthermorebuild a tescase (comparing diffraction pattern of cylinder with the one for the plane).
introduced sceneConfig(Manager) in order to predefine complete scenes for test-cases
fixed fresnel bug
some minor shader cleanup