[Tagging] shop=plumber vs shop=plumbing vs shop=plumbing_supplies

[Mateusz Konieczny]

What is the difference between these shops?

My expectation is that 

- shop=plumber is poorly tagged office of a plumber
- shop=plumbing is unclear tagging of shop with primarily plumbing supplies
- shop=plumbing_supplies is a good name for plumbing supplies shop but rarely used
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