Mouse brain  PET-CT-Atlas workflow:  verified that workflow works with the complete 20-region atlas.

Produced a Mouse brain atlas of all 20 regions that can be now processed by the Layer Control dialog.

Expanded current Layer Control dialog to 22 layers to accommodate an entire Mouse Brain Atlas.

Fixed the .IM Save\Load problem.  When original file (Atlas template) was provided it had invalid Unit Names for the voxel.  After Saving it to MIDAS, loading as a layer and the saving to FVX was causing the crash loading the resulting FVX file.