Ticket #4071: implemented GeoButton in Spreadsheet cells

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31954 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#4084 opacitySider at fill with image

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31955 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Renamed zip-2 to zip-3 to prevent caching problems

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31956 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Fix isEqual(segment 3D or 2D points)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31957 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Area of a polyhedron/polyhedronnet

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31958 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Fix isEqual(segment 3D or 2D points)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31959 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e