Changed previous SH definition to be compatible with Dipy's
Changed SHM basis to dipy, and added a --export_fod flag to the phantomas_dwis script.
Changed the Von-Mises Fischer kernel (needed a 4pi factor to normalize following the new definition of spherical harmonics).
emoved unused import in scripts/phantomas_dwis.
Modified scripts/phantomas_dwis so that fods exported are all zeros in non-wm regions.
 Added command-line option order_sh to script/phantomas_dwis
Changed pinv to classical way. Was getting a seg fault on higher order SH...
Merge pull request #14 from ecaruyer/compute_fod_dipy_mrtrix

Compute fod dipy mrtrix