added a complete sample policy and added more comments to other examples
added a complete sample policy
and added more comments to other examples

gridcf/gct,globus/globus-toolkit,globus/globus-toolkit,ellert/globus-toolkit,gridcf/gct,globus/globus-toolkit,ellert/globus-toolkit,gridcf/gct,ellert/globus-toolkit,ellert/globus-toolkit,globus/globus-toolkit,ellert/globus-toolkit,globus/globus-toolkit,gridcf/gct,ellert/globus-toolkit,globus/globus-toolkit,gridcf/gct,globus/globus-toolkit,gridcf/gct,ellert/globus-toolkit,ellert/globus-toolkit,globus/globus-toolkit