+"showtest" can be used to run a single test showing more details of
+what goes wrong, if anything. You don't need it as part of the
+regression test, but it's useful when debugging.
+
+Finally, "runcanon" checks that each of the queries when compiled and
+decompiled back to CQL (i.e. canonicalised) remains identical when
+recompiled and redecompiled.
+