Don't use sex

Occurrence level info cannot be provided.
Don't use lifeStage

Occurrence level information cannot be provided.
Forgot to add sex/LifeStage to delete-fields
Don't use individualCount

Users cannot add occurrence information
geodeticDatum = EPSG:3857

All coordinates are added by clicking on Google Maps, which has datum
[EPSG:3857](http://wiki.openstreetmap.org/wiki/EPSG:3857)
Suggest georeferenceSources with fixed value
Add comment on coordinateUncertaintyInMeters

See also [this
comment](https://github.com/Datafable/diveboard-gbif/pull/8#discussion_r
5576587) by @DimEvil