Omitted values include:
* office=yes ... too generic
* office=vacant ... not really a POI
* deprecated values (like office=administrative)
* tags that don't have a clear meaning (like office=camping,
office=healthcare, office=transport, office=design)
* tags where another tag is used more often, e.g:
office=religion is used more often than office=parish
office=construction_company is used more often than office=construction
office=engineer is used more often than office=engineering
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Co-authored-by: Tomas Pohanka <TomPohys@gmail.com>
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