Create files in the slice directory

Create `cropped.nc` and `unpacked.nc` in the slice directory, so that
several processes running `inst_eddies.py` for different slices can
run in parallel.

Inst_eddies/inst_eddies.py.in

@@ -51,6 +51,9 @@ def loop_inst_eddies(files, bbox, d, my_slice):
     # Short names (without blanks):
     writer.writerow(["date", "elapsed_NCO", "elapsed_Fortran"])
 
+    cropped_fname = f"SHPC/Slice_{my_slice}/cropped.nc"
+    unpacked_fname = f"SHPC/Slice_{my_slice}/unpacked.nc"
+
     for nc_file in files:
         print("inst_eddies.loop_inst_eddies: Date:", d)
         print("inst_eddies.loop_inst_eddies: Input file:", nc_file,
@@ -63,7 +66,7 @@ def loop_inst_eddies(files, bbox, d, my_slice):
                 xmin, xmax, ymin, ymax = bbox
 
                 try:
-                    nco_instance.ncks(nc_file, output = "cropped.nc",
+                    nco_instance.ncks(nc_file, output = cropped_fname,
                                       options
                                       = [f"--dimension=longitude,{xmin},{xmax}",
                                          f"--dimension=latitude,{ymin},{ymax}"])
@@ -71,13 +74,13 @@ def loop_inst_eddies(files, bbox, d, my_slice):
                     print(err.stdout)
                     raise
 
-                nc_file = "cropped.nc"
+                nc_file = cropped_fname
 
-            nco_instance.ncpdq(nc_file, output = "unpacked.nc",
+            nco_instance.ncpdq(nc_file, output = unpacked_fname,
                                options = ["--unpack"])
             elapsed_NCO = time.perf_counter() - my_pc
             my_pc = time.perf_counter()
-            subprocess.run([inst_eddies_exe, "unpacked.nc", "unpacked.nc"],
+            subprocess.run([inst_eddies_exe, unpacked_fname, unpacked_fname],
                            check = True, input = f"&dates_nml date = {d}, "
                            f"slice = {my_slice}/\n", text = True)
             elapsed_Fortran = time.perf_counter() - my_pc
@@ -96,8 +99,8 @@ def loop_inst_eddies(files, bbox, d, my_slice):
         d += 1
 
     perf_report.close()
-    os.remove("unpacked.nc")
-    if bbox: os.remove("cropped.nc")
+    os.remove(unpacked_fname)
+    if bbox: os.remove(cropped_fname)
 
     if my_slice == 0 and not os.access("SHPC/n_slices.txt", os.F_OK):
         with open("SHPC/n_slices.txt", "w") as f: f.write("1\n")