[boost] Python 3 support has landed on boost trunk

Hi there, as some of you may know, Haoyu Bai has worked over the summer on Python 3 support for Boost.Python. This work happened on a branch, which I merged back into trunk last night. Now we need to set up testers to run the testsuite with some Python 3 variant, as that is a new platform to track. I will see whether I can set one up on one of my machines. Regards, Stefan -- ...ich hab' noch einen Koffer in Berlin...