Patch from Torkjell Skomedal. Logging full transaction id
Added ICMP handling and RTT messurements.
Small API changes and fixes to get STUNTrace up and running.
Make sure TTL is reflected back correctly in the callback.
usint uint32_t intead of int.
Added DISCUSS data to callback result.
Merge branch 'STUNTrace' of https://github.com/cisco/NATTools into STUNTrace

Conflicts:
	stunlib/include/stun_intern.h
	stunlib/include/stunclient.h
	stunlib/src/stunclient.c