Update postgresql upgrade documentation
Add more detail about downtime implications of the ugprade. Specify ways to avoid it (point to slony document that Yorick wrote). Ways to minimize it, etc.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Add more detail about downtime implications of the ugprade. Specify ways to avoid it (point to slony document that Yorick wrote). Ways to minimize it, etc.