First experimental draft of subpalette handling. Not for use yet, as it is purely experimental and mockup.
add image for subpalettes.
add child listing information to tl_metamodel_dcasetting.
fine tuning, choose correct pid and subpalette id.
Further implementation of the subpalette handling.
Fix fourth level in breadcrumb.
apply special chars to breadcrumb text.
Change the order of the "subpalette"  to last position.
Change the callback "subpaletteButton". Only entries which can have subpalettes get the new button.
Change the order of parameters from an "array_replace_recursive" function.
correct metamodel retrieval in subpalette button callback.
Add disabled button for subpalettes to make the operation list look less frizzy.
add disabled button icon for subpalettes.
Change the "parseRootPaletteCallback" to find unused fields in the subpalettes.
Change the "Add all" function. It is now possible to use the "Add all" on subpalettes.
Change the "confirm messages" for adding attributes.
Implements issue #110 - missing operations in GeneralDataMetaModel::calculateSubfilter().
Merge branch 'subpalettes'