added &key to read-frame-command as per the TeX version
added &key to read-frame-command as per the TeX version

swflint/McCLIM,swflint/McCLIM,antifuchs/mcclim,onixie/mcclim,antifuchs/mcclim,onixie/mcclim,slyrus/mcclim,swflint/McCLIM,onixie/mcclim,slyrus/mcclim