Move call to Topology.RebuildRoutes

It doesn't belong in handleBroadcastTCP(), so moved it up
to the two places that cause that function to be called.
Merge pull request #271 from bboreham/258_rebuild_routes

Move call to Topology.RebuildRoutes

Closes #258
refactor
move explanation of peers and peer names
...plus some related doc shuffling
cosmetic
oops
grrr
Merge branch 'master' into 40_crypto_docs

Conflicts:
	site/how-it-works.md