Revert "P.Tulet 29/06/2021: SURFEX bugfix, PK%NSIZE_P can be zero leading to...

Revert "P.Tulet 29/06/2021: SURFEX bugfix, PK%NSIZE_P can be zero leading to missing initialization of dust variables + missing logical LCH_SURF_EMIS for chemical emission activation"

This reverts commit 5c068483.

Bugfix non resolu totalement, en cours de resolution par Marie Minvielle