Removed all instances of State_Grid%MaxTropLev

GeosUtil/gc_grid_mod.F90
Headers/state_grid_mod.F90
- Removed State_Grid%MaxTropLev, as it was not being used anymore.
  This was raised in issue geoschem/geos-chem #284.

This was confirmed to result in zero-diffs w/r/t the prior commit.

Signed-off-by: Bob Yantosca <yantosca@seas.harvard.edu>

GeosUtil/gc_grid_mod.F90

@@ -121,22 +121,17 @@ SUBROUTINE Compute_Grid( Input_Opt, State_Grid, RC )
 
     ! Hardcode maximum number of levels below tropopause and stratopause
     IF ( State_Grid%NZ == 47 ) THEN
-       State_Grid%MaxTropLev  = 38
        State_Grid%MaxStratLev = 44
     ELSE IF ( State_Grid%NZ == 72 ) THEN
-       State_Grid%MaxTropLev  = 40
        State_Grid%MaxStratLev = 59
     ELSE IF ( State_Grid%NZ == 40 ) THEN
        State_Grid%NativeNZ = 40
-       State_Grid%MaxTropLev  = 28
        State_Grid%MaxStratLev = 40
     ELSE IF ( State_Grid%NZ == 74 ) THEN
        State_Grid%NativeNZ = 102
-       State_Grid%MaxTropLev  = 60
        State_Grid%MaxStratLev = 72
     ELSE IF ( State_Grid%NZ == 102 ) THEN
        State_Grid%NativeNZ = 102
-       State_Grid%MaxTropLev  = 60
        State_Grid%MaxStratLev = 91
     ELSE
        ErrMsg = 'State_Grid%GridRes = ' // Trim( State_Grid%GridRes)// &

Headers/state_grid_mod.F90

@@ -66,7 +66,6 @@ MODULE State_Grid_Mod
      INTEGER            :: NativeNZ    ! NZ on the native-resolution grid
      INTEGER            :: MaxChemLev  ! Max # levels in chemistry grid
      INTEGER            :: MaxStratLev ! Max # levels below strat
-     INTEGER            :: MaxTropLev  ! Max # levels below trop
      INTEGER            :: XMinOffset  ! X offset from global grid
      INTEGER            :: XMaxOffset  ! X offset from global grid
      INTEGER            :: YMinOffset  ! Y offset from global grid
@@ -174,7 +173,6 @@ SUBROUTINE Init_State_Grid( Input_Opt, State_Grid, RC )
     State_Grid%NativeNZ     = 0
     State_Grid%MaxChemLev   = 0
     State_Grid%MaxStratLev  = 0
-    State_Grid%MaxTropLev   = 0
     State_Grid%XMinOffset   = 0
     State_Grid%XMaxOffset   = 0
     State_Grid%YMinOffset   = 0