Adapted wrapper makefile to support the Contiki Github release
Fix for incorrect use of setType and setCode use in the 6LoWPAN wrapper when processing ICMPv6 messages
ICMPv6_DESTINATION_UNREACHABLE message codes updated according to RFC 4443
IPv6::handleReceivedICMP - changed to catch ICMPv6 error packets and redirect them to ErrorHandling
Small reorganisation of the omnetpp.ini

- split PHY and MAC settings
- changed Battery settings
Finished fixing setCode and setType use, changed according debug outputs, added error checks