Verify validity of all changes introduced by Fokus into the original libcoap code.

We progressed on merging the upstream into our developments. We should verify that the code we brought in (to former libcoap) is still valid.

To ensure this, have a look at the following files (list taken from https://gitlab.fokus.fraunhofer.de/phoenix/phoenix/issues/90)

• .gitignore

• Makefile.in

• Makefile.phoenix

• coap_time.h

• configure.in

• examples/Makefile.in

• mem.c

• mem.h

• net.c

• net.h

• prereq.sh

• resource.c

• resource.h

• uri.c

• uthash.h

• examples/etsi_testcases.sh

• examples/runCoapClient.sh

• examples/runCoapServer.sh