Drag'n'Drop Interface

File Release Notes and Changelog

Release Name: ddi 1.5.1

Notes:
It is bugfix release.

Changes:
Legend:
! attention, it's important
? not approved bug / no clear view how to fix a bug
+ added feature
% changed/bug fixed
- removed

===
+ cleanup of __DDI__.currenTarget property on drag end and unsuccessful drag start
% handleOnDrop optimizations (use bitmasks instead of strings)
% __onDrop handler is called only if effectAllowed and dropEffect has compatible values
% __dropEffect reset on drag leave
% drag init optimization (library initializes only if it has something to drag, not on each node)
- some junk code
% onDragEnd 2nd time is called if current target is not equal to dragged element