Reimplement --securerandom

Seeds should be reproducable without the flag passed, and unreproducable with the flag passed.
With --securerandom, generate a 9-char alphanumeric string to use to make filenames differ.

Fill.py

@@ -1,4 +1,4 @@
-import random
+import RaceRandom as random
 import logging
 
 from BaseClasses import CollectionState