Provide full support for projections other than UTM or geographic coordinates.
This adds support for any projection of the input images.
Tasks to be solved:
- release new GeoArray version which does not set GeoArray.projection to '' in case the projection is not EPSG compatible
- pin arosics to that GeoArray version
- fix COREG_LOCAL.view_CoRegPoints() by making GeoArray.show_map() compatible with non-EPSG datasets
- validate coregistration results
- add tests that cover non-EPSG projections
- update documentation