Dti sig seems to be running, but it's not getting the best result.  I'm going to start feeding it better starting points and then see if it works.
Updated dti signal to be somewhat simpler.  Going very simple now. Branching again.
Now I'm just using a vanilla matrix X as my parameter.  I hard coded some constraints, it's very bad.
Merge pull request #3 from patrickeganfoley/justXForDTI

Just x for dti