* printing now does not disconnect annotations from the image

* removed threading which was problematic
* added support for manual annotation
* printing now in constrained layout

* scan headers now partly supported so they can be debugged in future.

* drltools roughly fixed
* not tested!!

* Fix broken __main__ from pt2
* printing/clipping fixed
* for broken things, please refer to pt2

* added functionality to settings
* minor debug of annotation function

* cleaned-up signalization in __main__ (reallocated some calls from
  matplotlib directly to Qt)
* separated image painting for printing and copying to separate file