Invent WAL timelines, as per recent discussion, to make point-in-time

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 2042b3428d3947987b27dbd4598fd9a5716ec9e8
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2004-07-21T22:31:26Z
Releases: 8.0.0
Invent WAL timelines, as per recent discussion, to make point-in-time
recovery more manageable.  Also, undo recent change to add FILE_HEADER
and WASTED_SPACE records to XLOG; instead make the XLOG page header
variable-size with extra fields in the first page of an XLOG file.
This should fix the boundary-case bugs observed by Mark Kirkwood.
initdb forced due to change of XLOG representation.

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