Hot Standby dev build (v8)

http://wiki.postgresql.org/wiki/Hot_Standby

v8 - resolves a dozen minor issues.

Dev build with various debugging enabled. Expect clean v10 on Friday.

All outstanding items from emails now listed on Wiki.

Some new refactoring targets and tuning opportunities identified as
knock-on effects from earlier refactoring.

Testing started on this about 3 hrs ago, nothing new found as yet.

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 Simon Riggs           www.2ndQuadrant.com
 PostgreSQL Training, Services and Support