[Tagging] sport=horse_racing unnecessary sport=equestrian

[Andreas Goss]

Is there a reason to keep sport=horse_racing?

Equestrian seems to defined as

> This broad description includes the use of horses for practical working purposes, transportation, recreational activities, artistic or cultural exercises, and competitive sport (!!!).
> https://en.wikipedia.org/wiki/Equestrianism

> Horse racing is an equestrian sport, involving two or more jockeys riding horses over a set distance for competition.
> https://en.wikipedia.org/wiki/Horse_racing

This seems to cover racing.

If this is about seperating tracks (racing vs. non-racing) then I think 
it should be done with a different tag than the sports tag. (leisure=* 
or equestrian=* see also http://www.olympic.org/sports)

- http://wiki.openstreetmap.org/wiki/Tag:sport%3Dequestrian
- http://wiki.openstreetmap.org/wiki/Tag:sport%3Dhorse_racing
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