Added metakit library which is a part of Bio-Format (needed for
certain image format).
* preliminary undo support.
* fixed minor bug in viewer focus change.
* improved ImageUtil.scaleQuality(..) method (better icon quality).
* fixed a minor bug with ROI polygon interaction (removing point while
dragging).
* added Sequence.calculateSize(..) method to help in calculating a
distance / surface from a specified number of pixel.
* search result producer are now sorted.