added a few debug lines in the filter_matches_epipolar_constraint function
replaced the sift keypoints matching step with Ives' binary from his Ipol
paper, to use the relative threshold instead of the absolute one.
added a python function to evaluate the pointing error in a ROI of a Pleiades
image.

Removed the restriction to the first 1000 sift points.
saved in a txt file the pointing error measured on each dataset
corrected wrong paths to some pleiades images