pgsql: Change ANSI to ISO standard: < * Add ANSI INTERVAL handling > *

Log Message:
-----------
Change ANSI to ISO standard:

< * Add ANSI INTERVAL handling

* Add ISo INTERVAL handling

< o Interpret syntax that isn't uniquely ANSI or PG, like '1:30' or
< '1' as ANSI syntax, e.g. interpret '1:30' MINUTE TO SECOND as

o Interpret syntax that isn't uniquely ISO or PG, like '1:30' or
'1' as ISO syntax, e.g. interpret '1:30' MINUTE TO SECOND as

649c649
< * Add pre-parsing phase that converts non-ANSI syntax to supported

* Add pre-parsing phase that converts non-ISO syntax to supported

Modified Files:
--------------
pgsql/doc:
TODO (r1.1482 -> r1.1483)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/TODO.diff?r1=1.1482&amp;r2=1.1483)