Fix inefficient use of buffers that reduces the potential throughput of basicPublish #142
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As per issue #141
Improve the performance of Channel sendOpen method by adding an sendUnflushed method to Connection that allows us to use the write buffer more efficiently by writing all the Frames of the message and then flushing the buffer rather than flushing each Frame. This significantly improves the performance of basicPublish for small messages where the bulk of the CPU load tends towards Syscall so with small messages we might have a Syscall per message vice per Frame.