Create tabs as ContentElement

Allows the easy-as-can-be creation of tabs and panes in acticles
The functionality is based on the Accordion-element to ensure an intuitive use based on learned workflows.
An arbitratry amount of tabs can be created in a single content element as a tabgroup. The behaviour of that tabgroup is specified within the content element.
The corresponding panes are wrapped within start- and stop-elements, so that they can contain the usual ContentElements.
This extentions contains:

• TabControl ContentElement
• MooTools-based TabControl plugin