Upgrade Python 2.6.4 to 2.6.5

["Martin v. Löwis"]

> If we install over an existing version of Python 2.6.5, will our PTH
> files and site-packages be preserved?
> 
> Or do we need to back out our 3rd party packages, install Python 2.6.5
> and then manually restore our 3rd party packages?

An upgrade installation will only replace the Python files, and leave
all other files alone.

Regards,
Martin