Two new functions to take a nifti file, read the descrip field and create a structure for DWI processing and one that will find a files full path given a name and starting directory.
Merge branch 'master' of https://github.com/vistalab/vistasoft

* 'master' of https://github.com/vistalab/vistasoft:
  Added casts to cope with non-double dims, datasize fields