Reject reverse range noderange

It has been stated that no one would want to do this
on purpose, and thus it should reject. The rationale
being that if no one wants to do this, but did it
anyway, they presumably made a mistake.

So now such attempts will be blocked.

Keep the dead logic around for now
in case a future opinion changes things back.

confluent_server/confluent/noderange.py

@@ -196,6 +196,7 @@ class NodeRange(object):
                 leftnum = int(leftbits[idx])
                 rightnum = int(rightbits[idx])
                 if leftnum > rightnum:
+                    return self.failorreturn(seqrange)
                     width = len(rightbits[idx])
                     minnum = rightnum
                     maxnum = leftnum + 1  # range goes to n-1...