- added instance variable parent_field (when create_components is used). This eases the upwards traversal for compound form fields.
- simplify usage of shuffling since it makes configuration via form-constraints easier. we use now one field "shuffle_kind" instead of the tow fields before.
- new abstract form-field class: ShuffleField * provide means for shuffling options and answers * three shuffle modes: - no-shuffling (parameter shuffle false) - shuffling on every call - shuffling for a seed (depending on an ID, always the same shuffling) - new form-field class text_fields, based on ShuffleField similar to checkbox, but with text fields and autocorrection via "correct_when" - support for richtext in checkbox labels - factored out set_feedback (was previously inline in xowf) - bump version number to 5.10.0d41