Introducing "phydev", the minimal physics package.
makegcm and makelmdz_fcm script have been updated to add CPP_PHYS preprocessing key when building with physics and CPP_EARTH for Earth (LMD physics) related routines or instructions in the dynamics.
Checked (on Vargas) that "dev" physics package compiles and runs well in all (seq/mpi/omp/mpi_omp) modes and that introduced changes do not modify results when using the "lmd" physics package.
EM + FH