Common dynamics:
Some updates to keep up with LMDZ5 Earth model evolution (up to LMDZ5 rev 1955).
Main change is the introduction of a "dyn3d_common" directory
to store files common to dyn3d and dyn3dpar.
See file "DOC/chantiers/commit_importants.log" for detailed list
of changes. These changes do not change results on test cases.
EM