components.CoReg_local_COREG_LOCAL:
- view_CoRegPoints(): added optional plotting of RANSAC flagged points

components.Geom_Quality_Grid.Geom_Quality_Grid:
- get_CoRegPoints_table():
    - updated algorithm for detection points outside the overlap polygon -> now much faster
    - implemented level 2 outlier filtering
- added function _flag_outliers()
- to_GCPList():    implemented level 2 outlier filtering