Patch for postgresql

I finally have remindme working completely under postgresql.

I had to remove the "group by" part of a select statement. Postgresql has different requirements for "group by". Here's part of the documentation for "group by":

When GROUP BY is present, it is not valid for the SELECT list expressions to refer to ungrouped columns except within aggregate functions, since there would be more than one possible value to return for an ungrouped column.

Perhaps "distinct" is needed here rather than "group by".

A similar patch should work for 4.4.