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Closes #314
Closes #313
As far as I know, the algorithm used doesn't have a well-known name so I linked to the source. There's a risk the site will one day go down in which case we could link to https://github.com/lognaturel/javarosa/blob/master/src/main/java/org/javarosa/core/util/GeoUtils.java#L101 instead