For Export/Printing, support "only countable"

[Adam Winer]

If you're doing a by-date life list report, you want the numbers to mean something - but "spuhs" and escapees get in the way. The final countable number is fine, but you have to be very careful to exclude all uncountable sightings in your query to get exact numbers.

[Adam Winer]

Added in commit 3214ec8