git-svn-id: http://google-refine.googlecode.com/svn/trunk@7 7d457c2a-affb-35e4-300a-418c747d4874
More work on the menu system to support sub-menus. Data table columns can now be collapsed/expanded. git-svn-id: http://google-refine.googlecode.com/svn/trunk@6 7d457c2a-affb-35e4-300a-418c747d4874