Modiefied udpmcastreceiver to receive on multiple interfaces.
    SSDP testing on F239 failed on binding the same port. Still trying.

	modified:   Makefile
	modified:   inetinterface.h
	modified:   mcastrecv_test.cpp
	new file:   ssdp_test.cpp
	modified:   udpmcastreceiver.cpp
	modified:   udpmcastreceiver.h
	modified:   udpmcastsender.cpp
	modified:   udpmcastsender.h
    Add UDP unicast sender and test. Not tested yet.

	modified:   Makefile
	new file:   udpsend_test.cpp
	new file:   udpsender.cpp
	modified:   udpsender.h