components.CoReg.COREG:
- __init__():
    - modified docstring (fmt_out keyword)
    - unsupported strings for output raster format are now properly catched
- _calc_shifted_cross_power_spectrum():
    - modified docstring
    - added optional figure of fft images
- _validate_ssim_improvement():
    - more stable code for handling not equal shapes of SSIM input arrays (seems to not be needed anymore)
    - bugfix for flagging tie points where SSIM kept the same (fixes issue of extensive point flagging during SSIM validity check)

components.CoReg_local.COREG_LOCAL:
- __init__():
    - modified docstring (fmt_out keyword)
    - unsupported strings for output raster format are now properly catched
- view_CoRegPoints(): added keyword 'showFig' for optinally muting figure output

components.DeShifter.DESHIFTER:
- __init__(): modified docstring (fmt_out keyword)
- correct_shifts(): bugfix for not performing resampling although the updated geotransform does not match he output grid

components.Geom_Quality_Grid.Geom_Quality_Grid:
- get_CoRegPoints_table():
    - bugfix for exception in case 'max_points' is given and actual number of points is below
    - added additional console output for number of found matches
- to_GCPList(): bugfix for crash in case no tie point passed all validity checks

components.Geom_Quality_Grid.TiePoint_Refiner:
- _RANSAC_outlier_detection():
    - bugfix for negative residual threshold)
    - empty coordinate arrays are now properly catched

- updated __version__