added PORT-ENABLE-SHEET, PORT-DISABLE-SHEET declarations.
added PORT-ENABLE-SHEET, PORT-DISABLE-SHEET declarations.

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