[cas] more vector fixes

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37399 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
[cas] more vector fixes

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37400 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
[giac] update tests

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37401 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e