Previously the count of tokens was claimed to be a count of addresses in use,
which is incorrect.
Also rename `appendAddresses` to `appendOwned` since it doesn't involve addresses.
Don't use the word "universe" in user-visible output; it is an internal term.
Removed everything but owned ranges from 'weave status ipam' results, for consistency with similar functions
This is mostly a matter of moving some files, changing package names,
changing some imports, and changing some type references.
We duplicate the odd constant & global var, and the intmac/macint
functions, since neither 'router' or 'mesh' nor, really,' common' are
a natural home for them.
Bryan Boreham