Use a better defined test of `cost_function.py`

Now that we read SHPC on the command line and the SHPC are not
necessarily separated by year, we can use input other than
`$PWD/Global_1993_2020`, and we do not have to specially prepare a file
`sgemented.gt` for this test.

Tests/tests.json

@@ -14,12 +14,15 @@
     {
 	"title": "Cost_functions",
 	"command":
-	["$src_dir/cost_function.py", "$PWD/Global_1993_2020/1993/SHPC_anti"],
+	[
+	    "$src_dir/cost_function.py",
+	    "$tests_old_dir/Extraction_eddies_region_2_noise/SHPC_anti"
+	],
 	"env": {"PYTHONPATH": "$src_dir/Overlap:$src_dir/Common"},
 	"symlink":
 	[
-	    "$PWD/Global_1993_2020/Eddy_graph_anti/node_id_param.json",
-	    "$PWD/segmented.gt"
+	    "$tests_old_dir/EGr2nd15md4/node_id_param.json",
+	    "$PWD/Segments/segments.graphml"
 	],
 	"exclude_cmp": ["timings.txt"]
     }