[boost] [1.47.0] permission to merge filesystem unmerged changesets

These change sets from the end of May were never merged to release. They include bug fixes, and have been stable in trunk. https://svn.boost.org/trac/boost/changeset/72309 https://svn.boost.org/trac/boost/changeset/72306 https://svn.boost.org/trac/boost/changeset/72278 My apologies for not catching this earlier. OK to merge? --Beman