Cleaned up the nitool CLI.
More CLI cleanup.
Fixed 'make_empty' option for NiftiWrapper constructor so the empty extension makes it into the header.

Allow nitool split/merge functions to work with non-extended nifti files (creates empty extensions).
Improved handling of data sets with undefined slice direction.
Bumped version number for point release.
Fixed bug in nitool_cli.embed where the wrong exception was being caught.
Bumped point release version number (again :/ )
Added classmethod NiftiWrapper.from_dicom to convert single slice or mosaic.
WIP: Most of the refactor is done. Need to fix up orientation handling.
Removed some debug print statements
Correct the left handed rotation matrix coming from the nibabel DicomWrapper, still need to fix voxel reordering.
Fixed reodering of voxels.
BF: Handle empty strings for DS and IS value reps when patching the dicom.
Fixed filling of data array for mosaic, still need to fix slice direction.
BF: Orientations now correct for mosaic and non-mosaic.
BF: Meta data extension now generated correctly for mosaic and non-mosaic.
Added classmethod NiftiWrapper.from_dicom to convert single slice or mosaic.
WIP: Most of the refactor is done. Need to fix up orientation handling.
Removed some debug print statements
Correct the left handed rotation matrix coming from the nibabel DicomWrapper, still need to fix voxel reordering.