RATYK-18: Make parent determination conditions less strict #65
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Currently, the import fails if an area doesn't have a parent ID and doesn't overlap almost precisely 100% with any other area (<0.000001 whatever units this is using), i.e. the error margin is very, very strict. The source data can be a bit inaccurate with the areas. Using relative values rather than absolute values for determining whether an area has enough overlap with a parent area makes the importer work again while still being reasonably accurate (the areas must overlap at least by 99.99%).
No unit tests, unfortunately. This library has a single unit test, so adding tests for this would be a pretty big task.