pgsql: Add: > * Prevent INET cast to CIDR from droping netmask, SELECT

Log Message:
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Add:

* Prevent INET cast to CIDR from droping netmask, SELECT '1.1.1.1'::inet::cidr

Modified Files:
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pgsql/doc:
TODO (r1.1405 -> r1.1406)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/TODO.diff?r1=1.1405&r2=1.1406)