Anterior-Posterior flipping of Trackvis tractogram

[Paolopost]

When Trackvis save a trk tractogram it doesn't preserve the original sagittal orientation and might introduce a flipping of y orientation.

If the source trk file is in LAP orientation, trackvis stores the saved trk with LPS orientation. The side effect is that the affine stored in the header of trk is no more compliant with the orientation of the original reference structural image.
Currently tractome doesn't check the information concerned the proper orientation stored in the header. The field of the header where this information is stored is "pad2"

To replicate this issue it is enough to load in trackvis a tract as trk file generated with dipy or mrtrix with either radiological (RAS) or neurological (LAS) orientation. Better if you choose as test example, a tract that is not symmetric with respect the y axis. Then save the tract as trk. Load this new trk file with tractome. The new tract will look flipped along the y axis.

[Paolopost]

The same issue holds if you load the tractogram with mrview.

[emanuele]

Could you test it again? I think that the last commit may have solved this bug.