Обсуждение: pgsql-server: Add cross-check that current timeline of pg_control is an

Log Message:
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Add cross-check that current timeline of pg_control is an ancestor of
recovery_target_timeline --- otherwise there is no path from the backup
to the requested timeline.  This check was foreseen in the original
discussion but I forgot to implement it.

Modified Files:
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    pgsql-server/src/backend/access/transam:
        xlog.c (r1.151 -> r1.152)

(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/access/transam/xlog.c.diff?r1=1.151&r2=1.152)