Disambiguate between "true" (?) node fossils and ones nested within

[rvosa]

The API is really rather good but one thing that is a bit problematic is that fossils nested within a query node are also returned. For example: http://fossilcalibrations.org/api/v1/calibrations?clade=Hominidae also gives me results for the Homo,Pan split and the Homo stem. This makes it harder to decide which calibration points to put where. Possible solutions might be i) apply an optional filter to omit nested calibration points, or ii) add an extra field to the JSON to indicate whether or not the calibration point is nested.

[rvosa]

Also, what doesn't really help in disambiguating is that some of the names that are returned don't TNRS when they clearly could. Example: "Humanity".