Change defconstant to defvar during development to satisfy Python.
Change defconstant to defvar during development to satisfy Python.

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