Cli join

Bring bootstrapping to the cli. To do this yourself, run client-cli, switch to server mode ('h' for help, 's' for server mode), 'n' to create a new quorum, and 'j' to have participants join the quorum.

When you create a new quorum, an inital wallet will be created. You'll supply the ID for this initial wallet (can't be '0'). I usually use '1'. All the other siblings must use this wallet to join the network, because we don't yet have a way to create other wallets (soon!).

Between Luke fixing the race condition (it was actually causing me problems!), and me patching a few misguided decisions, quorum joining seems to work with a moderate-to-high stability (sometimes getting several thousand blocks without failure, but sometimes failing for no apparent reason - I left the debugging statements in to help figure out what's going on when things randomly disconnect from eachother).
No they probably should be in the main loop. Right now it's pretty inconsistent.