For ticket #3065, remove the default context menu when the split layout panel changes

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25089 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
[giac] testing calling JavaScript Giac from Java

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25090 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
switching default CAS back to Reduce

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25091 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e