The fall is bringing, from various quarters, a rich harvest of requests for all kinds of variant data sets :-)

I'll need to take a look at parsing and applying additional/alternative SQL clauses so that that people can fine-tune for themselves. (On 'how hard', well, easy enough if you just want flat lists, but I'll need to give a little thought to the best way of doing it while preserving the branching hierarchy that one needs for visualisation).