Add initdb --sync-only option to sync the data directory to durable
storage.

Have pg_upgrade use it, and enable server options fsync=off and
full_page_writes=off.

Document that users turning fsync from off to on should run initdb
--sync-only.

[ Previous commit was incorrectly applied as a git merge. ]

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/630cd14426dc1daf85163ad417f3a224eb4ac7b0

Modified Files
--------------
contrib/pg_upgrade/pg_upgrade.c |    6 ++++++
contrib/pg_upgrade/server.c     |   10 ++++++----
doc/src/sgml/config.sgml        |    9 +++++++++
doc/src/sgml/ref/initdb.sgml    |   11 +++++++++++
src/bin/initdb/initdb.c         |   16 +++++++++++++++-
5 files changed, 47 insertions(+), 5 deletions(-)

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