Always write shapefile `extr_proj`

Always write shapefile `extr_proj` in procedure
`save_snapshot`. `save_snapshot` is only used in tests. In these
tests, `read_snapshot` is called so `extr_proj` is computed. We want
to check as much as possible with `save_snapshot`.

Overlap/Tests/save_snapshot.f90

@@ -9,7 +9,7 @@ contains
     ! Libraries:
     use jumble, only: arth, rad_to_deg
 
-    use read_grid_m, only: corner, step, nlon, nlat, uniform_lon_lat
+    use read_grid_m, only: corner, step, nlon, nlat
     use derived_types, only: snapshot, shpc_slice_handler
     use shpc_close_m, only: shpc_close
     use shpc_create_m, only: shpc_create
@@ -26,9 +26,9 @@ contains
     !-----------------------------------------------------------------
 
     call shpc_create(hshpc_cyclo, shpc_dir = "SHPC", cyclone = .true., &
-         slice = 0, with_proj = .not. uniform_lon_lat)
+         slice = 0, with_proj = .true.)
     call shpc_create(hshpc_anti, shpc_dir = "SHPC", cyclone = .false., &
-         slice = 0, with_proj = .not. uniform_lon_lat)
+         slice = 0, with_proj = .true.)
     call write_snapshot(s%list, hshpc_cyclo, hshpc_anti, d)
     CALL shpc_close(hshpc_cyclo)
     CALL shpc_close(hshpc_anti)