FW-199,202. For CoAP GET reply, respect token and insert payload marker

Changes based on COAP draft 18 spec. Includes:
* Mirror up to COAP_MAX_TKL (8) byte token in GET reply
* Add payload marker if reply includes content
* Includes apps: layerdebug, r6tus, rinfo, rleds, rt, rwellknown, rxl1
* FW-202: Fix published uri-path for layerdebug neighbor app
Merge pull request #54 from kb2ma/FW-199c

FW-199,202. For CoAP GET reply, respect token and insert payload marker
Fixing name of rleds__init() after merging #54.
SW-207. Cleanup of CoAP implementation (no functional changes).
FW-207. Enabling rinfo CoAP application by default.
FW-207. Cleaning up applications.
FW-207. Fixing rinfo and rleds.
FW-207. Cleanup.
FW-207. udpecho.py test script.
Fixing builds.
FW-207. Adding sample Python script for rinfo.
FW-207. Example Python script for rleds application.
FW-207. Adding rwellknown to default CoAP resources.
FW-207. Test script for rwellknown CoAP resource.
FW-207. Cleaning up r6tus resource.
FW-207. Renaming r6tus->r6t (WIP)
FW-207. Renaming r6tus->r6t (WIP).
FW-207. Renaming r6tus->r6t (done).
Fixing macpong builds
Merge branch 'develop' into develop_FW-186

Conflicts:
	firmware/openos/openwsn/openwsn.c
	firmware/openos/projects/python/SConscript.env
Fixed.