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Important bugfix. Otherwise bitswap cannot message peers
the node has not connected to yet :(

new Service interface

and other logging switches. I kept the u.PErr and u.POut in cli
commands, as those do need to write raw output directly.

We'll want a `type blocks.Block interface {}` later, but
for now, make sure Blockstore uses ptrs for both Get and Put.

+ fix NewBlock output compile error

Rather than pushing errors back down to lower layers, propagate the
errors upward.

This commit adds a `ReceiveError` method to BitSwap's network receiver.

Still TODO: rm the error return value from:

    net.service.handler.HandleMessage

This is inspired by delegation patterns in found in the wild.

sending

true -> always send to peer

false -> use ledger-based strategy described in IPFS paper draft 3

fix(bitswap) pass go vet

fixes #97

https://github.com/jbenet/go-ipfs/issues/97

changing the bitswap interace breaks tests and makes things a bit
difficult going forward. I think I have a temporary solution to replace
the async method.

this commit partially reverts changes from:

ec50703395098f75946f0bad01816cc54ab18a58

https://github.com/jbenet/go-ipfs/commit/ec50703395098f75946f0bad01816cc54ab18a58

@perfmode using non-async version as apparently there's
a bug in async. will look into it.

@perfmode boom

test(bitswap) run synchronously to aid the scheduler

fix(bitswap) Put synchronously. Then notify async

to avoid letting client rely on order for correctness