[cas] fix for Point + Vector in 3D

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@38213 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
[cas] d⊗e displayed as a vector (3D)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@38214 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e