fix unit tests - better ddt handling and case insensitivity

Author: Courtney Peverley

test/unit/python/sample_files/write_init_files/physics_inputs_ddt2.F90

@@ -143,7 +143,7 @@ subroutine physics_read_data(file, suite_names, timestep, read_initialized_varia
 
                   select case (trim(phys_var_stdnames(name_idx)))
                      case ('potential_temperature')
-                        call read_field(file, 'potential_temperature', input_var_names(:,name_idx), 'lev', timestep, phys_state%theta)
+                        call read_field(file, 'potential_temperature', input_var_names(:,name_idx), 'lev', timestep, phys_state%thermo%theta)
 
                      case ('air_pressure_at_sea_level')
                         call read_field(file, 'air_pressure_at_sea_level', input_var_names(:,name_idx), timestep, phys_state%slp)
@@ -321,8 +321,8 @@ subroutine physics_check_data(file_name, suite_names, timestep, min_difference,
 
                select case (trim(phys_var_stdnames(name_idx)))
                case ('potential_temperature')
-                  call check_field(file, input_var_names(:,name_idx), 'lev', timestep, phys_state%theta, 'potential_temperature', min_difference,      &
-                       min_relative_value, is_first, diff_found)
+                  call check_field(file, input_var_names(:,name_idx), 'lev', timestep, phys_state%thermo%theta, 'potential_temperature',               &
+                       min_difference, min_relative_value, is_first, diff_found)
 
                case ('air_pressure_at_sea_level')
                   call check_field(file, input_var_names(:,name_idx), timestep, phys_state%slp, 'air_pressure_at_sea_level', min_difference,           &

test/unit/python/sample_files/write_init_files/physics_inputs_ddt_array.F90

@@ -143,7 +143,7 @@ subroutine physics_read_data(file, suite_names, timestep, read_initialized_varia
 
                   select case (trim(phys_var_stdnames(name_idx)))
                      case ('potential_temperature')
-                        call read_field(file, 'potential_temperature', input_var_names(:,name_idx), 'lev', timestep, phys_state%T(:, :, ix_theta))
+                        call read_field(file, 'potential_temperature', input_var_names(:,name_idx), 'lev', timestep, phys_state%t(:, :, ix_theta))
 
                      case ('air_pressure_at_sea_level')
                         call read_field(file, 'air_pressure_at_sea_level', input_var_names(:,name_idx), timestep, phys_state%slp)
@@ -321,7 +321,7 @@ subroutine physics_check_data(file_name, suite_names, timestep, min_difference,
 
                select case (trim(phys_var_stdnames(name_idx)))
                case ('potential_temperature')
-                  call check_field(file, input_var_names(:,name_idx), 'lev', timestep, phys_state%T(:, :, ix_theta), 'potential_temperature',          &
+                  call check_field(file, input_var_names(:,name_idx), 'lev', timestep, phys_state%t(:, :, ix_theta), 'potential_temperature',          &
                        min_difference, min_relative_value, is_first, diff_found)
 
                case ('air_pressure_at_sea_level')