r52153: implement part attribute with values "header" and "footer" to put rows in thead or tfoot instead of tbody of table
r52163: stop etemplate_widget_template::instance from returning a stdClass object for a not found template after content-expanding, leading to a fatal error in etemplate_widget line 338
r52175: there should be no validation for disabled widgets
r52176: $cont is NOT root but current name-space in old eTemplate, leaving now identical $_cont for now
r52194: fixed eT2 data returned from client for case where name-space contains more then one component eg. "nm[rows]"
r52195: fixed not run validation on server-side for templates included via template tag
r52196: implement formatting of numbers in read-only widget
had to change signature of validate function to get information for autorepeating through
removed entity-encoding of square brackets, as they mess up validiation (havnt found any negative effects so far)
- also used currently to supply options for predefined selectboxes (eg. select-cat), need to discuss if we want to fetch these per ajax
- new widget method run, which runs a given method on all widgets (and children) supporting it, eg. used now for validate
