[ajax js/css] modconcat fix: load code exactly once (auc, fcayre)
* introduces cw.ajax namespace (currently hosts only recent modconcat functionality)
* handle load-one/load-many-at-once edge case
* properly handle already-loaded js resource
* avoid .appendTo to trigger script evaluation since from jquery 1.5 this results in uncached ajax calls
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