undo/redo first version 

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23550 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
4.9.104.0

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23551 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e