t-res app and example compatibility with coap 18
fixed radio issue in cooja, redrawn t-res csc
added a new test script and libcoap18 executable (64bit)
Merge branch 'azzara-grillino' of https://github.com/andreaazzara/contiki-tres into azzara-grillino

Conflicts:
	apps/tres/tres-interface.c
	examples/tres/src/tres-node/Makefile
	examples/tres/src/tres-node/tres-test.c