/// \brief Returns the 'Value Representation' (e.g. "PN" : Person Name,
/// "SL" : Signed Long), found in the Dicom Header or in the Dicom
/// Dictionnary, of the current Dicom Header Entry
/// \brief Returns the 'Value Representation' (e.g. "PN" : Person Name,
/// "SL" : Signed Long), found in the Dicom Header or in the Dicom
/// Dictionnary, of the current Dicom Header Entry