pgsql: Add: > > * Add REINDEX CONCURRENTLY, like CREATE INDEX

Log Message:
-----------
Add:

>
> * Add REINDEX CONCURRENTLY, like CREATE INDEX CONCURRENTLY
>
>   This is difficult because you must upgrade to an exclusive table lock
>   to replace the existing index file.  CREATE INDEX CONCURRENTLY does not
>   have this complication.  This would allow index compaction without
>   downtime.

Modified Files:
--------------
    pgsql/doc:
        TODO (r1.2057 -> r1.2058)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/TODO.diff?r1=1.2057&r2=1.2058)
    pgsql/doc/src/FAQ:
        TODO.html (r1.558 -> r1.559)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/FAQ/TODO.html.diff?r1=1.558&r2=1.559)