Revision 201

Removed intermediary objects of cv_thermo_m, access suphec_m
directly. Procedure cv_thermo disappeared, all objects are named
constants.

In cv_driver and below, limited extents of arrays to what is needed.

lv, cpn and th in cv30_compress were set at level nl + 1 but lv1, cpn1
and th1 are not defined at this level. This did not lead to an error
because values at nl + 1 were not used.

Removed test on ok_sync in phystokenc because it is not read at run
time. Printing min and max of output NetCDF variables is heavy and
archaic.

Used histwrite_phy in phytrac.