Added new computation for sigma
changed a comment
new function to compute image noise
added more comments
ENH:
  I added the code that allows for tracking fibers using the mrTrix toolbox.
  The code is added under vistasoft/externals/mrtrix
ENH: Removed file
Merge pull request #6 from frakkopesto/vs_mrtrix

ENH: Added code to call the mrTrix tool box from matlab
some more comments etc
finished bug checking dtiComputeImageNoise
Merge pull request #4 from jyeatman/robust_tensor

Robust tensor
Re-adding coords2Indices.m, as it was deprecated prematurely and is still necessary.
ENH: Added tensor-based tractography. Improved functionality by adding a more flexible path definiton to saved out the results.
ENH: Added fuction to check the mrtrix processes that were precomputed.
Merge pull request #7 from aspanu/master

Added indices2Coords.m into the main repo
ENH: Changes a path call erro to dwi2tensor
ENH: Removed direct call to mrtrix functions in a specific path location. It will now call the defualt system functions.
Merge branch 'master' of https://github.com/vistalab/vistasoft into vs_mrtrix
ENH: Working on some files related to MRTRIX to make the tensor -baed trcking work
updated functions so that they will return the resampled fiber group
changed the name of the output for fgResampled