GPLv3 license consistent with GPLv3 code already in

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Note that at minimum osgeo_importer/models.py and osgeo_importer_prj/settings.py are already marked GPLv3.

Other licenses included (MIT, ISC, "OSI Approved: SOME LICENSE") should all be GPL-compatible; but I am not a lawyer, so that is only my lay understanding. I welcome corrections. I don't have the ability at present to verify chain of custody for all contributions to this repo. I also don't have any qualified opinion on the implications of using GPLv3 django apps in a Django project, or what it would take to mark this as a different license. So this should probably get some sort of legal review before we use django-osgeo-importer for anything.

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GNU's doc describes compatibility of licenses that I am aware of possibly applying to this project: https://www.gnu.org/licenses/license-list.html

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Sara mentioned that the package.json lists its license as ISC, and that's true. But I'm not sure how the GPL status of the Python side affects this or not. Also, the entirety of that package.json with only a couple edits is just copy-pasted from some other repo (see package.json for which).

edit: it's at https://github.com/lorem--ipsum/smashing-article/blob/master/package.json