Beginning s13sitedemo2

We should be moving from Mako to the Django template engine.
Public and error pages now using the Django template engine.
User and content management templates ported from Mako to Django.
Atom feed template ported from Mako to Django

Also implemented make_href in ContentModels.Article as a method
so that it can be called with no arguments.
File manager templates migrated from Mako to Django.
TMS templats migrated from Mako to Django

Additionally, created a couple of templatetags for helping with
getting values for CMS- and TMS-related stuff.
Removed old s13sitedemo and replaced with the development folder.