move save_rps_totals function to io_services.

Part of code clean-up.

src/services/io_services.py

@@ -9,3 +9,9 @@ def load_raw_data(path):
             if (r[1] != "Time Stamp"):
                 data.append( (r[1], r[2]) )
     return data
+
+def save_rps_totals(totals, path):
+    with open(path, mode="w") as result:
+        wtr = csv.writer(result)
+        for k, v in totals.items():
+            wtr.writerow([k,v])