Common dynamics:
Some work to enforce total tracer mass conservation in the dynamics.
Still to be further studied and validated.
For now these changes are triggered by setting a "force_conserv_tracer"
flag to ".true." in run.def (default is ".false." to not change anything
with respect to previous versions).
When force_conserv_tracer=.true. then:
- Rescale tracer mass in caladvtrac after tracer advection computations
- Recompute q ratios once atmospheric mass has been updated in integrd
These steps technically ensure total tracer mass conservation but it
might be the tracer advection scheme and/or time-stepping updating
sequence of fields that should be rethought or fixed.
EM
