Templates can now use Repeaters instead of DataLists

I'm working on a jQuery based rotator template for the next release of the Articles module. In order to do this properly, I needed to replace the DataList control that Articles usually uses with a Repeater control because the Tables rendered by the DataList weren't compatible (or necessary). Luckily, the nice clean architecture of the Articles module made it quite easy to make it so templates can use either a Repeater or a DataList.

This change will be included in the next release. It shouldn't have any impact on existing DataList-based templates.