Add c-capnproto
Add _main_readw
Add raft listener/peers
Fix comment
New-style raft options
Skeleton for raft
Move srand call, seed from pid
Add raft.capnp
Make u2_reck_plan push to roe
Merge pull request #118 from atax1a/master

fingerprint ~net
Sacrifice a %bull bug.
Merge branch 'master' of github.com:urbit/urbit
WIP Make _lo_work rafty

Carts are now batches of events waiting to be or just recently
persisted. _lo_work calls u2_reck_kick on the last batch of events,
removes every batch that's been through Raft, and then prepares the next
batch.

TODO make _lo_punk et al stick things on roe

TODO move disk persistence to raft.c

TODO raft_push: lo_open / mark / lo_shut
WIP rafty loop.c

_lo_save() sticks events on roe for processing in later calls to
_lo_work().
WIP raft single instance

Shove all our disk stuff crudely into raft.c.
Fixes to our hi/lojack logic

This doesn't actually fix the prompt-eating bug, but it sure looks like
it ought to, doesn't it?
Trivial fixups
WIP Move lug_u to u2_raft
fix weev wing
better json