Further changes for new Design

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25738 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Removed DensityPlotPanel. Modified syntax of the command

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25739 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
[giac] make sure If[] works

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25740 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Sorry for the oversight. New test for new syntax of CmdDensityPlot

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25741 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
[giac] run 'restart' before each command

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25742 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e