move geometry-related functions to Tk::GeometryCalc
remove unused code
new script for testing Tk::GeometryCalc
abdeckung.bbd update

* Berlin almost complete (except Kladow-Kaserne and Murellenschlucht)
* added Ahrensfelde, Hönow, Waldesruh
* added Oranienburg, Lehnitz, Birkenwerder, Hohen-Neuendorf (old work
  by Andreas Titz)
* added missing parts in Potsdam (Potsdam-Nord, Babelsberg-Nord,
  Hermannswerder, Waldstadt)
* added smaller bits like Teltow-Nord, Mahlow-Waldstadt
fragezeichen2org: bugfix (?)

Somehow without the fix the PLAN keyword never happened (I don't
understand why).
fragezeichen2org: show which file provides the route search numbers

Change looks larger than it is, largely because of new indentation.