 Summary of important user-visible changes for dicom x.y.z (yyyy/mm/dd):
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 ** The function isdicom has been completely rewritten and will perform
    much faster for invalid dicom files.  It also no longer accepts a cell
    array of strings since it reduces its usefulness by other functions.
    Such use can be replaced with:

      cellfun (@isdicom, cell_array_filenames)

