a result; ideally it should not at all change the internal state;
  definitely it should not store the result.
Comments, layout.

This reverts commit e202d1ef.

Status: FitTest02 fails.

- speed as before
- App --isgisaxs07 shows huge difference, but fu.test passes

Extended print() methods.

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.

Doxygen comments to normalizer classes.

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

Doxygen comments.

Formfactors: integrand of imaginary part is real.

Tried removal of Rotate from Geometry which however is required by IsGISAXS07.
Will be reverted in a minuted.