Add the clinical trial modules as optional.
List DICOM modules in order to make it easier to audit SOPs.
Add the DICOM device and specimen modules as optional.
Put ImagePixel and ImagePlane into same order as standard.
Add the Contrast/Bolus Module.
Generate more information up-front to ensure consistency.
In vtkDICOMGenerator, make slice ordering depend on OriginAtBottom.

MR and CT images, or any SOP class that uses the ImagePlaneModule,
will be unaffected by this.  However, the SC SOP Classes do not set
an (x,y,z) position for each slice, so slice ordering for them is
crucial.
Generate the InstanceUIDs within the vtkDICOMGenerator.
Add location to Image Plane Module in generator.
Add a datetime generator to vtkDICOMUtilities.