Drop the literal -> string conversion code.
Fixed the codestyle for 'switch' statements.
Locking cleanup in the Engine.
Locking cleanup in the Slave.
Drop now useless 'streamed' tag.
Codestyle fixes.
Fixed sending big chunks of data.

If the outgoing ring buffer capacity was too small to fit the outgoing
chunk, it was never resized because of the invalid size check.
A missing changelog update.
Break intense decoding loops for huge messages.
Fixed adding POLLOUT to existing socket watchers.
Changelog update.
Close sockets when their initialization fail.
Changelog update.