Juan 13/05/2024:PHYEX/turb/mode_prandtl.f90, add acc loop collapse(3) on...

Juan 13/05/2024:PHYEX/turb/mode_prandtl.f90, add acc loop collapse(3) on JK*JIJ loop , for better performance (on MNH55 , array syntax keeped )

src/PHYEX/turb/mode_prandtl.f90

@@ -329,6 +329,7 @@ END IF
 ZMINVAL = (1.-1./CSTURB%XPHI_LIM)
 !
 !$acc kernels present(ZW1,ZW2)
+!$acc loop collapse(2) independent
 DO JK=1,IKT 
   DO JIJ=IIJB,IIJE 
    ZW1(JIJ,JK) = 1.