First commit with new files for extending the vigraqt with qgraphicsview-framework
Replace QImage creation wirh  new Qt4.X creation syntax
Added components for the graphicsview framework of Qt 4.X. These classes allow to display BasicImages on a GraphicsScene. Additionally an appropriate view was implemented as well as a special graphicsitemtype, which is returned when adding a BasicImage to a vigraqgraphcisscene
Added the new graphicsview-framework files to the CMake build scripts.
Finalized vigraqimage example using the qgraphics framewor, which comes with Qt 4.X. And image can be displayed, browsed, normalized, investigated, and printed to printer or to pdf file.
replaced CMake opengl reference linking params with working ones (Mac OS X)
added finding of PYTHON_SITE_PACKAGES directory to the file for installation path
Edited PythonSIP QtProject file: although not working - a reference to the libvigraqt would be required for the vigraqt-python bindings to be linked with qmake/make