Added mention of DREI-USER package.
Added mention of DREI-USER package.

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