Allow any 7FE0 group element to hold pixel data.
Allow any 7FE0 group element to hold pixel data.

This is necessitated by the addition of 7FE0,0008 "FloatPixelData"
and 7FE0,0009 "DoubleFloatPixelData" as alternate storage locations
for the pixel data.

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