FR: function adding GPS coordinates to HospiNet object #20
Description
I would be nice to be able to add GPS coordinates to HospiNet.
The function needs to:
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check that the coordinates are valid
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check that there is a match for each hospital ID in the database
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add the GPS data in normalized column names in the main database (it's better than keeping it separately if one wants to split the network or be able to compute geographic distance of transfers.