BUG: Derived images no longer fails for T1-only sessions

BUG: DWI Preprocessing no longer outputs to 'DTIPrepOutput' file

BUG: DWI Raw names nodes based on session AND file name.  This prevents Slicer from mistakenly thinking an image is already loaded due to matching node names
Merging onto release branch
Fix for recordID Error.
ENH: Module is modifiable using configuration files
STYLE: Moved module to top directory