[boost] Updated boost::base_from_member for C++2011

This is in changeset 76982.  I tried it on my system, with Apple-supplied GCC 4.0.1 and GCC-direct 4.6 (from MacPorts) on a Mac/PowerPC system.  It just does the slam-dunk implementation of this concept that C++2011 allows (and therefore showing its power).  The new code should be isolated to only systems that can handle it.  Now the code is over the wall, and it's time to see who crashes & burns (hopefully no one) in the tests.... Daryle W.