Pre-updating fragmentation branch changes
Merge with updates to packet.h on fragmentation branch
Intermediate commit. Updated a bunch of stuff to include fragmentation handling, among those: user space app, determine_incoming_tuple, hairpinning, and configuration.
Merge branch 'fragmentation_packet_db_incoming_tuple' into fragmentation

Conflicts:
	include/nat64/comm/types.h
	include/nat64/mod/packet.h
	mod/core.c
	mod/packet.c
	mod/types.c
	unit/Makefile
Fixed several bugs caused by the merge.