Reverse direction for pyramid net

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@30575 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Remove unused "Test3D.java"

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@30576 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Try to avoid NaN in 3D view scale / rotation values

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@30582 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e