Log Message:
Changes 2.2.0:
* Shared Libraries are now named so as to allow having multiple versions of \ 
Slony installed simultaneously on a database cluster
* Let DDL for EXECUTE SCRIPT to be specified inline
* Added a RESUBSCRIBE NODE command to reshape clusters.
* The FAILOVER process has been reworked to be more reliable.
* Major "protocol" change; rather than constructing cursors to query \ 
logged updates, version 2.2 now uses the COPY protocol to stream data into log \ 
tables on subscribers.