don't auto-create slider for Curve[t³, t², t, 0, 2] #3490

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@27313 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
fix problems with version checks

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@27316 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e