fixed data dictionary editor DND and partial rework of kernel DND.

org.fortiss.tooling.base.ui/trunk/META-INF/MANIFEST.MF

...rg/fortiss/tooling/base/ui/command/ConnectionCommand.java

...ng/base/ui/compose/ConnectorConnectionCompositorBase.java

...ui/compose/HierarchicElementConnectionCompositorBase.java

...e/ui/dnd/gef/ConnectionCompositionDropTargetListener.java

...ortiss/tooling/base/ui/dnd/gef/ConnectionDragContext.java

...ortiss/tooling/base/ui/dnd/gef/ConnectionDropContext.java

...base/ui/dnd/gef/ElementCompositionDropTargetListener.java

...g/fortiss/tooling/base/ui/dnd/gef/ElementDropContext.java

...ase/ui/dnd/jface/ViewerElementCompositionDropAdapter.java

...org/fortiss/tooling/base/ui/editor/DiagramEditorBase.java

.../fortiss/tooling/base/ui/editor/TreeViewerEditorBase.java

...ui/editpart/policy/ConnectionGraphicalNodeEditPolicy.java

.../ui/editpart/policy/RelayCreateCommandEditPolicyBase.java

...g/fortiss/tooling/base/ui/utils/RectangleLayoutUtils.java

...ng/kernel/ui/dnd/ElementCompositionDropTargetAdapter.java

.../org/fortiss/tooling/kernel/ui/util/DragAndDropUtils.java