[flyweight] rw_locking policy patch for review

i have implemented a rw_locking policy for flyweight factories, based on
boost::shared_mutex. to achieve that, i had to adapt the factory
interface ...

joaquín, would it be possible for you to review the patch? it is based
against the version of flyweight from the boost sandbox svn ...

best, tim

--
tim <at> klingt.org
http://tim.klingt.org

Cheat your landlord if you can and must, but do not try to shortchange
the Muse. It cannot be done. You can't fake quality any more than you
can fake a good meal.
  William S. Burroughs

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