pgsql: Move documentation of all recovery.conf option to a new chapter.

Log Message:
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Move documentation of all recovery.conf option to a new chapter.
They used to be scattered between the "backup and restore" and "streaming
replication" chapters.

Modified Files:
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pgsql/doc/src/sgml:
backup.sgml (r2.142 -> r2.143)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/backup.sgml?r1=2.142&r2=2.143)
filelist.sgml (r1.66 -> r1.67)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/filelist.sgml?r1=1.66&r2=1.67)
high-availability.sgml (r1.48 -> r1.49)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/high-availability.sgml?r1=1.48&r2=1.49)
postgres.sgml (r1.90 -> r1.91)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/postgres.sgml?r1=1.90&r2=1.91)

Added Files:
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pgsql/doc/src/sgml:
recovery-config.sgml (r2.1)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/recovery-config.sgml?rev=2.1&content-type=text/x-cvsweb-markup)