Move test `R4_15_splitted`

Move test `R4_15_splitted` before the tests that use it.

Overlap/Tests/short_tests.json

@@ -538,6 +538,16 @@
             ]
         ]
     },
+    {
+	"title": "R4_15_splitted",
+	"description": "This is not really a test. Rather it creates input necessary for tests.",
+	"env": {"PYTHONPATH": "$src_dir/Inst_eddies/Analysis"},
+	"command":
+	[
+	    "$src_dir/Overlap/Tests/split_SHPC.py",
+	    "$tests_old_dir/Region_4_15_days/SHPC"
+	]
+    },
     {
         "input": "&config_graph_nml cyclone = f/\n&main_nml k = 20461/\n",
         "title": "Read_snapshot_several",
@@ -620,15 +630,5 @@
 	    ]
         ],
 	"input": "&main_nml cyclone = t, grid_lon_lat = f/\n"
-    },
-    {
-	"title": "R4_15_splitted",
-	"description": "This is not really a test. Rather it creates input necessary for tests.",
-	"env": {"PYTHONPATH": "$src_dir/Inst_eddies/Analysis"},
-	"command":
-	[
-	    "$src_dir/Overlap/Tests/split_SHPC.py",
-	    "$tests_old_dir/Region_4_15_days/SHPC"
-	]
     }
 ]