Additional operations of GBIF data

Missing docstring.

Missing docstring for SimpleSDMLayers.longitudes(records::GBIF.GBIFRecords). Check Documenter's build log for details.

Missing docstring.

Missing docstring for SimpleSDMLayers.latitudes(records::GBIF.GBIFRecords). Check Documenter's build log for details.

Missing docstring.

Missing docstring for SimpleSDMLayers.mask. Check Documenter's build log for details.

Missing docstring.

Missing docstring for SimpleSDMLayers.mask!. Check Documenter's build log for details.