Revision 189

There was a function gr_phy_write_3d in dyn3d and a function
gr_phy_write_2d in module grid_change. Moved them into a new module
gr_phy_write_m under a generic interface gr_phy_write. Replaced calls
to gr_fi_ecrit by calls to gr_phy_write.

Removed arguments len, nloc and nd of cv30_compress.

Removed arguments wd and wd1 of cv30_uncompress, wd of cv30_yield, wd
of concvl, wd1 of cv_driver. Was just filled with 0. Removed option
ok_gust in physiq, never used.

In cv30_unsat, cv30_yield and cv_driver, we only need to define b to
level nl - 1.