ICE-9575 DataTable component was modified to make sure that ColumnGroup and Row components are visited when DataTable.visitTree is invoked so that template component creation won't duplicate the component re-creation during restore view phase.

git-svn-id: http://anonsvn.icesoft.org/repo/icefaces3/trunk/icefaces@38256 1de00972-ac04-4911-a46b-06793c8d78d9