Updated overlay classes to accomodate the new link subsystem ids

[giro94]

Subevent header now has:

	uint64_t link0_subsystem : 3;
	uint64_t link1_subsystem : 3;
	uint64_t link2_subsystem : 3;
	uint64_t link3_subsystem : 3;
	uint64_t link4_subsystem : 3;
	uint64_t link5_subsystem : 3;
	uint64_t reserved2 : 14;

instead of the previous:

	uint64_t source_subsystem : 3;
	uint64_t reserved2 : 29;

Function
std::vector<DTC_SubEvent> DTC_Event::GetSubsystemData(DTC_Subsystem subsys)
has same behavior and returns all subevents with at least 1 subsys ROC

New function
std::vector<DTC_DataBlock> DTC_Event::GetSubsystemBlocks(DTC_Subsystem subsys)
directly returns the subsys datablocks.

Function
DTC_Subsystem DTC_SubEvent::GetSubsystem(uint link = 0)
is bacward compatible

Function
void DTC_SubEvent::SetSourceDTC(uint8_t id, DTC_Subsystem subsystem = DTC_Subsystem_Other)
is backward compatible but is deprecated and should be changed/removed.
A quick search finds these modules using this function:

• Offline/DAQ/src/ArtBinaryPacketsFromDigis_module.cc
• mu2e-pcie-utils/dtcInterfaceLib/mu2esim.cpp

There is currently NO consistency check between the SubEventHeader link*_subsystem and the DataBlock header GetSubsystemID()

[giro94]

Update:

Function
void DTC_SubEvent::SetSourceDTC(uint8_t id, DTC_Subsystem subsystem = DTC_Subsystem_Other)
is now fully backward compatible.