* remove almost-empty types module
* lock when writing message (that's the only place the lock matters, and
only when the message is > max msg size)
* logging updates (log in consistent order, makes reading logs easier)
* raise EOF from readExactly only if no bytes have been read (to signal
that _no_ bytes were lost)
* Peer resultification and defect only
* Fixing some tests
* test fixes
* Rename peer into peerid
* better result error message in identify
* further merge fixes
Tanguy Cizain
Jacek Sieka
Giovanni Petrantoni
李婷婷