Completed creation of mess form factor that supports polarized calculations; refactor: remove spaces before public, protected, private

Doxygen comments.

manual editing of @brief ("defines ...", "implements ..."), removed multiple white lines

Multiple changes to let Isgisaxs9-like samples to register properly they components in parameter pool

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

Added draft of low level objects for representing scattering data (enabling variable dimensionality)