Add -t option to allow easy test selection.
Action verbose option correctly.
Tweak operation counts. Add empty and new instances tests.
Enable comparisons across different warp factors. Change version.
diff --git a/Tools/pybench/Instances.py b/Tools/pybench/Instances.py
index 9b1929d..199b129 100644
--- a/Tools/pybench/Instances.py
+++ b/Tools/pybench/Instances.py
@@ -4,7 +4,7 @@
 
     version = 0.2
     operations = 3 + 7 + 4
-    rounds = 60000
+    rounds = 600*17
 
     def test(self):