CardView: fixes for drag'n'drop.
 * reverted to a Repeater for card stack, as the PathView always loops on the path
 * avoid using "move" on VisualDataModel groups, as it is bugged in some cases. Prefer using remove+insert instead.
 * reduce the debug logs

Signed-off-by: Christophe Chapuis <chris.chapuis@gmail.com>