toolbar icon centered

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@22774 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
toolbar margin

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@22775 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Removed warnings

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@22776 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Remove version hack for XML

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@22777 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e