feature: add a packet to read out parameter from the stack (i.e. DPV standard parameter)

DPS API manual states in chapter 5.3.2 Parameterization that the DPV standard parameter (i.e. watchdog settings, ident number etc.) can be sent to host application with PROFIBUS_FSPMS_CMD_CHECK_USER_PRM_IND. But it is not implemented this way. The user gets only the UserPrm (from byte 8 on), but not the norm specific parameter.

A new packet shall be defined to let the user to read out additional parameter from the stack (i.e. Norm parameter, diagnosis etc.)