Add script to split SHPC

Only useful for tests.

Overlap/Tests/split_SHPC.py

+#!/usr/bin/env python3
+
+import filter
+import functools
+import shutil
+from os import path
+import sys
+
+def in_date_range(shape_rec_extr, shape_rec_outer, shape_rec_max, date_1):
+    return date_1 <= shape_rec_extr.record.date <= date_1 + 4
+
+if len(sys.argv) != 2: sys.exit("Required argument: SHPC-directory")
+my_dir = path.join(sys.argv[1], "Slice_0/Anticyclones")
+
+for n in range(3):
+    date_1 = 20454 + n * 5
+    accept = functools.partial(in_date_range, date_1 = date_1)
+    filter.filter(my_dir, f"SHPC/Slice_{n}/Anticyclones",
+                  renumber = True, accept_func= accept)
+
+with open("SHPC/n_slices.txt", "w") as f: f.write("3\n")
+fname = path.join(sys.argv[1], "grid_nml.txt")
+shutil.copy2(fname, "SHPC")