Philippe 17/12/2020: set MNHVERSION to 5.4.4

src/MNH/version.f90

-!MNH_LIC Copyright 2002-2019 CNRS, Meteo-France and Universite Paul Sabatier
+!MNH_LIC Copyright 2002-2020 CNRS, Meteo-France and Universite Paul Sabatier
 !MNH_LIC This is part of the Meso-NH software governed by the CeCILL-C licence
 !MNH_LIC version 1. See LICENSE, CeCILL-C_V1-en.txt and CeCILL-C_V1-fr.txt
 !MNH_LIC for details. version 1.
@@ -44,9 +44,9 @@ IMPLICIT NONE
 !
 NMNHVERSION(1)=5
 NMNHVERSION(2)=4
-NMNHVERSION(3)=3
+NMNHVERSION(3)=4
 NMASDEV=54
-NBUGFIX=3
+NBUGFIX=4
 CBIBUSER=''
 !
 END SUBROUTINE VERSION