tidy Address helper functions,
make ordering of members consistent in allocate and claim,
make linter happier,
remove some unused items, and
update some comments
Using the Ring CRDT and Weave gossip, provides an interface
for the weave script to allocate IP addresses in `weave run`,
`weave start` and `weave expose`.
See docs/ipam.md for implementation details, and site/features.md
for user-visible changes.
Bryan Boreham