- Added a first version of an xowiki renderer - Reworked the renderer infrastructure to allow for refining templates between renderers (e.g., xowiki-like links in the yuidoc theme etc.) introduces - Templates can now also be defined, stored, and maintained through Tcl scripts (rather than separate template files only). - Clarified the concepts of theme/layout/renderer etc. Major cleanup. - yuidoc: Fixed an issue with setting filter css classes while no filter checkboxes are available.