Common.h: Block write image with georef and nodata
dg_mosaic.py.in: Compensate for pitch diff
 - added an --output-prefix option
- check that DETORIGINX, PD, EPH, and ATT are same among xml files
stereo_corr: No need for interest points if DEM D_sub is used
InterestPointMatching: Print stats first, check matrix later
stereo_corr: Consolidate code
Sessions and InterestPointMatching: Consistent notation
stereo_corr: Local disparity
stereo_corr: Cleanup