Acdh-histogis

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* some modifications to dump data methods added
* function to create singel JSONL file from single files added

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* dump data methods added

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* code refactoring
* new methods
* query_by_service_id to fetch data by geonames, gnd and wikidata ID/URL

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* `fetch_geonames_rdf` and `query_by_geonames_id` methods added

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* First version