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

Extended print() methods.

Ex #09b still fails.

- 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

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

All composite objects are now derived from ICompositeSample, which in turn is a tree of ISample objects.

Changes in pro file to compile in separate directory. Additional Makefile.am for qt-less compilation