Ticket #4819: proof of concept for the future solution commented out

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@38173 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
* Remember that user does not want to sign in
* Allow saving when not signed in and offline

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@38174 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Make model consistent with login state

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@38175 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Missing from previous commit

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@38176 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e