[Tagging] Bitcoin: Distinction of purchase through website and cash register/Point of sale

[Andreas Goss]

> My reasoning is that payment:bitcoin=yes is a general tag which means
> that payment is accepted at the store.

In my opinion if there is no additional information then all the payment 
tags imply point of sale. Otherwise I would also have to tag a store 
that takes credit cards with payment:credit_cards=yes + 
payment:point_of_sale:credit_cards=yes
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