ENH: Update DTIPrep from r296 to r297

-Remove unused Mac installation files
-Does not build ITK_Module_MGHIO when DTIPrep is built as a Slicer extension to avoid conflicts
Merge pull request #651 from fbudin69500/update-DTIPrep

ENH: Update DTIPrep from r296 to r297
ENH: FiberViewerLight.s4ext was updated

r70:
http://www.nitrc.org/plugins/scmsvn/viewcvs.php?view=rev&root=fvlight&revision=70
-New project homepage
-Moved FiberViewerLight to Diffusion category
r69:
http://www.nitrc.org/plugins/scmsvn/viewcvs.php?view=rev&root=fvlight&revision=69
BUG: Missing INSTALL_*_DIRECTORY if not build as an extension
Merge pull request #653 from fbudin69500/update-FiberViewerLight

ENH: FiberViewerLight.s4ext was updated