share common code

document config options

add configuration file and command option parsing

start of MacOS support

Add SMF manifest for illumos and solaris

use duid already stored, if present.

release on shutdown; config section marked by barriers

start to split OS-specific functionality into modules.

notes

some minor tweaks to get things working on smartos, also include lifetimes in RAs

working protocol implementation; with caveats

t1 and t2 are not handled properly in edge cases
retry intervals and limits are not completely according to the spec
we don't handle multiple prefixes at the moment nor do we handle lifetimes

starting to handle message 3 and 4

add encoding and more protocol logic

Add more message types.

Basic packet handling works. Need to add niceties and then all of the handshake logic.