Refactoring of Drag and Drop complete. Draggable properties isUsable, isOriginal included, but functionality connected with them is not complete. Found and fixed bug with z-index ordering.

Fixing bugs. Now resize of window does not mess up targets. Dragging is much smoother on touch pad. Removed border from draggable when it is not in slider. The whole applet fits into min-width of main part of page.