#4285 InterpolateImageModel and applied to desktop.

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@33572 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Avoid creating sessionStorage when not possible

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@33573 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e