Implement more filtering tools for Casual grade observations

[lotteryd]

I have found that the geo=false or =true chunk still doesn’t respectively pull up or exclude a strange set that are captured by the bounding box urls I have above, but still have blank coordinates and report a “Location Unknown” map.

However, this tiny bounding box can fish them up. Here’s everything whether 0,0 or blank:

https://www.inaturalist.org/observations/identify?reviewed=any&quality_grade=needs_id%2Ccasual%2Cresearch&per_page=100&photos=true&d1=1900-01-01&nelat=0&nelng=0&swlat=0&swlng=0