pgsql: Add: > > * Allow configuration of backend priorities via the

Log Message:
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Add:

* Allow configuration of backend priorities via the operating system

Though backend priorities make priority inversion during lock
waits possible, research shows that this is not a huge problem.
http://archives.postgresql.org/pgsql-general/2007-02/msg00493.php

Modified Files:
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pgsql/doc:
TODO (r1.2132 -> r1.2133)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/TODO.diff?r1=1.2132&r2=1.2133)
pgsql/doc/src/FAQ:
TODO.html (r1.633 -> r1.634)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/FAQ/TODO.html.diff?r1=1.633&r2=1.634)