`gis:create-turtles-from-points`: Turtle placed outside of envelope when envelope set to `gis:envelope-of` the dataset in question

[JamesHovet]

Steps to Reproduce:

• Download https://data.cityofchicago.org/Public-Safety/Fire-Stations/28km-gtjn, the fire stations map from the city of chicago
• import it into the GIS extension
• run gis:set-world-envelope gis:envelope-of <the_fire_stations_dataset>
• run gis:create-turtles-from-points fire_stations_dataset turtles []
• Observe the following error:

Tried to create turtle outside GIS envelope at: (-85.04320641132607, 41.60757853756865, NaN). Try setting your GIS world envelope with gis:set-world-envelope (gis:envelope-union-of (gis:envelope-of your-first-dataset) (gis:envelope-of your-second-dataset) etc.))

• Run show gis:world-envelope and observe the output [-85.35946191554375 -84.99406832484011 41.607578537568656 41.97297212827229]

The desired behavior should be for the turtle to be placed within the NetLogo world, even if it has to get nudged just a tiny bit to not be on the edge of the envelope