[Tagging] Deprecate healthcare=pharmacy and healthcare=hospital

[Joseph Eisenberg]

> iD also brings up the "suggestion" that existing amenity=clinic, pharmacy &
> (I think) dentist tags by themselves are "incomplete" & should be upgraded
> by adding healthcare=
> eg https://www.openstreetmap.org/edit#map=21/-28.07641/153.42326

That's interesting. I wonder if there is a way to find what percentage
of the healthcare=pharmacy tags were added by iD or other editors in
this way.