... which now fully concentrates on theory

polarization factors moved to Chapter 2.

bibliography.

- remove chapter on Usage
- merge Parts II and III into one Part II = Reference
- outcomment sections BasicRef::Intensity and ForFactor::Usage
- replace wrong section heading Mesocrystals by Lateral order ...
- revert to conventional page numbering, except in draft mode

Assemblies.

constructors.

Appendix to accelerate compilation.

about grazing incidence and multilayers.

Started revision of scattering theory.