Debug to send_packet
Merge branch 'master' of github.com:NICMx/NAT64
Some debug messages
Merge branch 'master' of github.com:NICMx/NAT64

Conflicts:
	mod/send_packet.c
Merge branch 'master' of github.com:NICMx/NAT64
Fixing the issue #47 (handling hairpinning).