documented CAP::MessageStack failure with yaml session serializer unless YAML::Syck installed; field content checks for gallium_data.pl; report_link_options.tt amended to work with authorisation function disabled}
git-svn-id: https://jti.org.uk/svn/hmds_lims/trunk@1880 4177bd82-f056-0410-812d-caef170e3fa0
