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

Implemented cloneInvertB() on ISample classes and use a MultiLayer with inverted magnetic field for the outgoing scattering states if necessary; refactored MagneticCoefficientsMap

Ex #09b still fails.

specific implementation RotationZ_3D.
Raw material for all other transforms temporarily moved to
UnusedTransform3D.h.
Status: Core compiles, FunctionalTests not yet.

- 3rd person form: "Does" this or that.
- For all const methods that return something: "Returns" ...
- For boolean return value: "Returns true if " ...

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

Implement multiparameter fitting (3): added necessary normalization to enable comparison with experiments: added factor coming from particle densities

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