Merge pull request #108 from francopestilli/master

Fixed issues related to mrtrix tracking and dt6MigrationCode
Merge pull request #110 from francopestilli/master

Added a script to build the mrtrix files structure
FRANCO: I was testing the new version of the code on Doras' computer. I fixed a few minor bugs.
Merge pull request #111 from francopestilli/master

Motion correction estimates plot saved out as PNG during motion correction.
Merge branch 'master' of https://github.com/vistalab/vistasoft