Add RealWorldValueMappingSequence to generator.
Add RealWorldValueMappingSequence to generator.

This is part of the General Image Module as of 2013.  Soon I have to update
all the modules according to the new standard.

dgobbi/vtk-dicom,dgobbi/vtk-dicom,hendradarwin/vtk-dicom,dgobbi/vtk-dicom,hendradarwin/vtk-dicom,hendradarwin/vtk-dicom