Bug 42248 - Undo-redo support on Test Plan tree modification
Changed icons to use open_icon_library-CC and have a different color for undo and redo
Bugzilla Id: 42248

git-svn-id: https://svn.apache.org/repos/asf/jmeter/trunk@1622941 13f79535-47bb-0310-9956-ffa450edef68