Retrieve Tango class property history

        :param argin: Str[0] = Tango class
        Str[1] = Property name
        :type: tango.DevVarStringArray
        :return: Str[0] = Property name
        Str[1] = date
        Str[2] = Property value number (array case)
        Str[3] = Property value 1
        Str[n] = Property value n
        :rtype: tango.DevVarStringArray

def DbGetClassPropertyHist(self, argin):
        """ Retrieve Tango class property history

        :param argin: Str[0] = Tango class
        Str[1] = Property name
        :type: tango.DevVarStringArray
        :return: Str[0] = Property name
        Str[1] = date
        Str[2] = Property value number (array case)
        Str[3] = Property value 1
        Str[n] = Property value n
        :rtype: tango.DevVarStringArray """
        self._log.debug("In DbGetClassPropertyHist()")
        class_name = argin[0]
        prop_name = argin[1]
        return self.db.get_class_property_hist(class_name, prop_name)