[cas] bugfix: type x, plot it, label now appears at output

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@28007 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
remove "this" (methods)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@28008 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#697 fix

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@28009 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e