Revision 28

Removed unused "diagedyn.f" and "undefSTD.f".

In "etat0", the variable "dt" of module "temps" was defined from
"landicered.nc", which was meaningless and useless. Replaced "dt" by a
local trash variable.

Removed variable "dt" from module "temps" and created instead a local
variable of "leapfrog" and an argument of "integrd".