[v9.2] Start new timeline for PITR

Folks,

The nice people at VMware, where I work, have come up with a small
patch to allow PITR to create a new timeline.  This is useful in cases
where you're using filesystem snapshots of $PGDATA which may be old.

PFA a patch implementing and documenting same :)

Cheers,
David.
-- 
David Fetter <david@fetter.org> http://fetter.org/
Phone: +1 415 235 3778  AIM: dfetter666  Yahoo!: dfetter
Skype: davidfetter      XMPP: david.fetter@gmail.com
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