* Did some brief testing with Slony 1.2, 2.0 and 2.1 and appears to all work as expected.
* Added some extra logic to try to better handle multiple node failover in Slony versions pre 2.2. Seems to work well for Slony 1.2, however issues in 2.0 and 2.1 limit usefulness.
* Added some extra sanity checks to autofailover, with new parameters autofailover_perspective_sleep_time, autofailover_majority_only, autofailover_is_quorum.  Still think logic used to pick best node to failover to is flawed.