make it possible for a reporter template to disable auto-grouping

At represent, Clark reports will aggregate (group by) on all output fields that do not have an aggregate filter. This is done to avoid (apparently) duplicate rows in the output.

However, there are times when one wants a report to simply emit all rows (the discussion in bug 1599634 contains an example). To that end, I propose bumping up the reporter template version and adding a boolean to control whether auto-grouping is disabled.

If that boolean is false, previous behavior would apply. If it is try, columns would *not* be aggregated unless at least one of them explicitly specifies an aggregate filter.

Evergreen master