Extend 'Restriction' syntax :

Extend 'Restriction' syntax :
void SerieHelper::AddRestriction(uint16_t group, uint16_t elem,
                                 std::string const &value, int op)
op belongs to :

/// \brief comparaison operators
enum CompOperators {
   GDCM_EQUAL = 0,
   GDCM_DIFFERENT,
   GDCM_GREATER,
   GDCM_GREATEROREQUAL,
   GDCM_LESS,
   GDCM_LESSOREQUAL
};