[boost] [Pool] Attention all Pool users....

Folks, I'm planning on merging the all new and shiny version of Boost.Pool in the sandbox under https://svn.boost.org/svn/boost/sandbox/guild/pool/ into Trunk pretty soon unless anyone objects. There are a lot of bug fixes in this version, plus updated docs (see https://svn.boost.org/svn/boost/sandbox/guild/pool/libs/pool/doc/pool.pdf). Please let me know if you spot any issues, or if there's something that needs addressing that hasn't been (no promises on that one though!). Regards, John.