For 3.0, the OS X installer was changed to disable the default 
installation of the Unix Command Line Tools package, the package that 
installs links in /usr/local/bin to the corresponding entries in the 
framework bin directory.  The intent was to follow the practice of other 
Python 3.x installers to ensure that python 2.x and python 3.x could co-
exist.  However, with the framework structure of OS X python, each 
python version has its own bin directory and the lack of 3.x links in 
/usr/local/bin has led to some user confusion.

This patch modifies the OS X installer for 3.x to again re-enable the 
Unix Command Line Tools package by default but to only install versioned 
links into /usr/local/bin (i.e. /usr/local/bin/python3.1) but not 
disturbed any unversioned links (i.e. /usr/local/bin/python will 
continue to point to an installed python2.x).  The only exception is 
that 3.x will install a /usr/local/bin link to its 2to3, which is 
currently not versioned.  The framework bin directory is unchanged and 
contains both versioned and unversioned links.