[boost] [function] Unmerged changes and open tickets

Hi all, Boost.Function doesn't seem to have been merged to release for the last 8 months. There are also a number of open tickets which look fairly easy to fix. So, if no one objects, I'll try to deal with them in a few days time and then merge outstanding changes a little while later. These tickets fix various problems: https://svn.boost.org/trac/boost/ticket/2642 https://svn.boost.org/trac/boost/ticket/2847 https://svn.boost.org/trac/boost/ticket/2929 https://svn.boost.org/trac/boost/ticket/3012 There's also an optimization which looks sensible to me: https://svn.boost.org/trac/boost/ticket/2319 Daniel