add version_info

Add a (named) tuple "version_info" which contains the the version information. The specification is below (taken from the Python documentation of "sys.version_info"):

The "VERSION" string should be generated from the "version_info". It should be investigated if ``setuptools`` understand the format of "version_info", and if this removes the problems that rpm thinks that "0.4.0.alpha.0" is later than "0.4.0.final.0"

version_info
---------------

A tuple containing the five components of the version number: major, minor, micro, releaselevel, and serial. All values except releaselevel are integers; the release level is 'alpha', 'beta', 'candidate', or 'final'. The version_info value corresponding to the Python version 2.0 is (2, 0, 0, 'final', 0). The components can also be accessed by name, so sys.version_info[0] is equivalent to sys.version_info.major and so on.
New in version 2.0.

https://sourceforge.net/apps/trac/freeode/ticket/39