several changes in the pointing_accuracy module:
several changes in the pointing_accuracy module:

- rescaling of rotation and shear parameters for the optimisation, by
  a factor 1e6, to make them less sensitive
- center of the rotation changed to the center of the big image (20000,
  20000)
- other (better ?) implementation of the bfgs algorithm: fmin_l_bfgs_b
  instead of fmin_bfgs
- the evaluation_from_estimated_F function now returns the mean of the
  algebric distances between keypoints and their epipolar lines. Thus we
  can see if there is a bias.
- added a 'linear' version of the cost function (currently not used)
- check if parameters of the cost_function are in a reasonable bounding
  box before evaluating
- in the filtered_sift_matches_roi function, lowered ransac error
  tolerance used to determine whether or not a point is compatible with
  a model, from 1 pix to .3 pix

MISS3D/s2p,carlodef/s2p,dyoussef/s2p,mnhrdt/s2p,dyoussef/s2p,jmichel-otb/s2p,jmichel-otb/s2p,jmichel-otb/s2p,jmichel-otb/s2p,MISS3D/s2p,MISS3D/s2p,mnhrdt/s2p,dyoussef/s2p,MISS3D/s2p,dyoussef/s2p,carlodef/s2p