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Lastly a code convention question. Is it standard practice to declare classes, even internal ones, within the .cc files? It is hard to use tools such as doxygen with this approach. It is also hard to follow the code structure. 

9. Additional notes on question. It seems that a public free list
allocator would also make sense to set the headroom size for each buffer
at creation. Different implementations will need different headroom
depending on protocol. Of course one could just allocated a large enough
space for all possibilities, but it is hard to anticipate that and some
headroom needs may be excessive compared to the norm.

10. Perhaps the IBufChain::insert functions should include a passed
value which determines the amount of space to copy to each buffer. It
seems now that the max possible size is used for each buffer.