CAY-1839 - applying pull request

commit 37d8e6113d6ef5a7f9419e43ceab77f40c7f4a60
Author: Savva Kolbechev <s.kolbachev@gmail.com>
Date:   Mon Oct 6 15:29:29 2014 +0300

    CAY-1839 | DnD for DataMaps, link all unlinked DataMaps with DataNode, Undo/Redo;
CAY-1839 Allow to link DataMaps to DataNodes from DataNode editor

release notes