Revision 129

Removed arguments day0, anne0 of procedures initdynav and
inithist. Use directly day_ref, annee_ref instead.

Moved variables annee_ref, day_ref of module temps to module
dynetat0_m. Deleted variables dayref and anneeref of module conf_gcm_m
and removed them from namelist conf_gcm_nml. These variables were
troubling intermediary on the way to annee_ref and day_ref. Gave as
default values to annee_ref and day_ref the default values of dayref
and anneeref. Moved the test on raz_date from main unit gcm to
procedure dynetat0. Created namelist dynetat0_nml. Read annee_ref and
day_ref from standard input in dynetat0 and redefine them from
"start.nc" if not raz_date. Rationale: 1 - Choose the best programming
from the point of view of program gcm only, forgetting program ce0l. 2
- The normal case is to define annee_ref and day_ref from "start.nc"
so put them in module dynetat0_m rather than in conf_gcm_m. 3 - Try to
always read the same namelists in the same order regardless of choices
in previous namelists. Downsides: 1 -We now need the file "dynetat0.f"
for the program ce0l, because dynetat0_m is used by dynredem0. 2 - We
need to define annee_ref and day_ref from procedure etat0.

Removed useless variable day_end of module temps.