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