InsightToolkit: Added support for python wrapping ('--python') - still experimental

Added support for python wrapping, yet did only test on my system. The wrapping causes some errors normally, because of some older dependent packages (gccxml and cswig). These can be alleviated by using ansi-C and setting gccxml enviroment flags. I also included the module ITKVtkGlue, to connect ITK and VTK.

This is my first time, so please don't blame me too much if I am doing things wrong.