sql_interval is now sql_date_math

[Max Kanat-Alexander]

	On the trunk, $dbh->sql_interval is gone, and there is now a function
called $dbh->sql_date_math instead. It works differently, so if you have
code or patches using sql_interval currently, you'll have to update them
to use sql_date_math instead if they are going to work with the trunk.

	https://bugzilla.mozilla.org/show_bug.cgi?id=602165

	-Max
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