Rename stereo_mpi to parallel_stereo
Reflect modification of renaming stereo_mpi to parallel_stereo
Make parallel_stereo use gnuparallel
parallel_stereo: Support ISIS and user crop win
dem_geoid: More robustness for finding path to geoids
parallel_stereo: Minor cleanup
dem_geoid: Minor clarification
stereo: Factor out utility for creating dir from prefix
dem_geoid: Refine datum checks and height compensation
dem_geoid: If we fail to guess the datum, warn and make a guess
parallel_stereo: Work with crop win relative to L.tif
2.2.1
Bug fixes, here comes 2.2.2