git-svn-id: svn://svn.gna.org/svn/sgpemv2/trunk@961 3ecf2c5c-341e-0410-92b4-d18e462d057c
- Delete the "serialize()" method of concrete_environment, since useless git-svn-id: svn://svn.gna.org/svn/sgpemv2/trunk@721 3ecf2c5c-341e-0410-92b4-d18e462d057c