Improve usability around region/subregion #201
Merged
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Issue reported in #198 can't be resolved by improving the file name handling, at least not easily. The issue stems from the decision to tightly couple to Geofabrik's download server. This PR raises an error when a slash is detected in the region name and subregion is none, in these cases the portion after the last
/
should be in the subregion.This also updates the documentation to add a section about the region/subregion, and show this example. I'm sure there's room for improvement in the wording, this is a quick start to improve this.