#4207 Basic tab handlers (minmax, x:y ratio)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@33032 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Fix for #4186

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@33033 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Fix for #4186

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@33034 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e