Insert new header comment block, remove old one, manually improve file comments (defines / implements), change brief function description to doxygen format, remove some outcommented code

Added form factor for prism3 (of IsGISAXS) and adapted DWBASimulation to deal with multiple particles

Rewritten IsGISAXS Example 3 code using the new Experiment class (2): added MultiLayerDWBASimulation class.

Refactored decorator classes, added Experiment, Beam and Detector classes and added prototype pattern to many classes (clone() function)

ISingleton, IFactory and IFunctionalTest base classes. TestFactory now use them. New arguments handling in main.

Also added necessary project files for using eclipse as IDE