added LabelingTests that fail for copyCursor() and copyRandomAccess() on LabelingType accessors.
changed Util.printCoordinates to take RealLocalizable instead of Localizable.
(It can print Localizable too, of course)
bugfix: copy() methods for NativeImgLabeling accessors fixed
added SparseLabelingTests for copyCursor() and copyRandomAccess() and fixed a bug in NtreeCursor copy constructor.