pkg: drop python 2.5 compatibility (closes #2711624)
2.5 is not common anymore. Dropping compatibility will help moving to a code
base compatible with Python 3.3
Schema of the data
------------------
First take a look at the data schema_ then try to remember that you are browsing
through a heap of data by applying stylesheets to the results of queries. This
site is not a content management system with items placed in folders. It is an
interface to a database which applies a view to retreived data.
.. _schema: schema