Redone ZB packet structure, added abstract classe libelpacket that defines functions like getMask, setMask, getRFData, setRFData
Made new packets (addnoderesponse and mask request)

	modified:   makefile
	modified:   packet_test.cpp
	modified:   packets/incomingpacket.cpp
	modified:   packets/libeladdnodepacket.cpp
	new file:   packets/libeladdnoderesponse.cpp
	new file:   packets/libeladdnoderesponse.h
	modified:   packets/libeliopacket.cpp
	new file:   packets/libelmaskrequest.cpp
	new file:   packets/libelmaskrequest.h
	new file:   packets/libelpacket.h
	modified:   packets/receivepacket.cpp
	modified:   packets/receivepacket.h
	modified:   packets/transmitrequestpacket.cpp
	modified:   packets/transmitrequestpacket.h
	modified:   ../errors.h
	modified:   ../packet.h
Added libelmaskresponse class

	modified:   makefile
	modified:   packets/libeladdnoderesponse.cpp
	modified:   packets/libeladdnoderesponse.h
	new file:   packets/libelmaskresponse.cpp
	new file:   packets/libelmaskresponse.h