pgsql: Reorder basebackup options, to list pg_basebackup first

Reorder basebackup options, to list pg_basebackup first

Since this is the easy way of doing it, it should be listed first. All
the old information is retained for those who want the more advanced way.

Also adds a subheading for compressing logs, that seems to have been missing

Branch
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REL9_2_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/3cdd19b0a66fc8845282d4012b0fcf3e94515e7b

Modified Files
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doc/src/sgml/backup.sgml | 149 +++++++++++++++++++++++++--------------------
1 files changed, 83 insertions(+), 66 deletions(-)