Philippe 28/08/2020: budgets: LES_Z_NORM: use 4D arrays instead of 6D and modify order of dimensions

(cherry picked from commit 7259278fe7f81754d0a20bb3986896895a822790)
(cherry picked from commit f79456a7)

Philippe 28/08/2020: budgets: LES_NORM_4D: improve treatment of units (problems when too many space characters at the end)

Philippe 08/07/2020: bugfix: budgets: add missing multiplication by prhodj for scalar variables budgets

(cherry picked from commit 595b075a)

# Conflicts:
#	src/LIB/SURCOUCHE/src/mode_msg.f90
#	src/MNH/advecmet.f90
#	src/MNH/advecmet_4th.f90
#	src/MNH/advecscalar.f90
#	src/MNH/advecscalar_4th.f90
#	src/MNH/advection_metsv.f90
#	src/MNH/advecuvw.f90
#	src/MNH/default_desfmn.f90
#	src/MNH/fct_met.f90
#	src/MNH/fct_scalar.f90
#	src/MNH/ice4_sedimentation_split_old.f90
#	src/MNH/ini_budget.f90
#	src/MNH/ini_modeln.f90
#	src/MNH/init_for_convlfi.f90
#	src/MNH/les_masksn.f90
#	src/MNH/lima.f90
#	src/MNH/lima_adjust.f90
#	src/MNH/lima_cold.f90
#	src/MNH/lima_cold_hom_nucl.f90
#	src/MNH/lima_cold_slow_processes.f90
#	src/MNH/lima_meyers.f90
#	src/MNH/lima_mixed.f90
#	src/MNH/lima_nucleation_procs.f90
#	src/MNH/lima_phillips.f90
#	src/MNH/lima_precip_scavenging.f90
#	src/MNH/lima_warm.f90
#	src/MNH/lima_warm_coal.f90
#	src/MNH/modd_budget.f90
#	src/MNH/modn_budget.f90
#	src/MNH/mpdata.f90
#	src/MNH/mpdata_scalar.f90
#	src/MNH/pressure.f90
#	src/MNH/resolved_cloud.f90
#	src/MNH/turb.f90
#	src/Rules.LXgfortran.mk

Philippe 30/06/2020: budgets: bugfix for HENU source in concentration of activated nuclei C2R2/KHKO budget

(cherry picked from commit 6bcd998d)

(cherry picked from commit 428283bb)
(cherry picked from commit 11f19d36)

(cherry picked from commit 428283bb)

(cherry picked from commit 0f6a75e7)

Philippe + Benoit Vié 18/06/2020: improve removal of negative scalar variables: use ZEXN instead of PEXNREF

Philippe + Benoit Vié 11/06/2020: improve removal of negative scalar variables + adapt the corresponding budgets