Revision 187

Made variable nl of module cv30_param_m a parameter. There was no
coding allowing it to change.

Removed arguments nloc and nd of cv30_undilute2, arguments nloc, nd
and na of cv30_unsat. Just use klon and klev directly (going for
clarity).

Removed the option cvflag_grav = f. This was a lot of redundant code,
probably obsolete, and cvflag_grav was initialized to true with no
provision for changing it (as in LMDZ).

In cv30_unsat, downdraft_loop started at i = nl + 1, but for i >= nl,
i > inb, so num1 = 0.