First experimental version of PCP support.
Merge branch 'master' into pcp
Not prodding ohp/pcp/dnsmasq unless the system has been really quiet for 3 seconds (no HNCP changes there). The TLVs sent across HNCP can and will be refreshed as need be, though.
Merge branch 'master' into pcp

Conflicts:
	src/hnetd.c
Merge branch 'master' into pcp