Defined and used permissions

Addresses https://github.com/my-koop/service.website/issues/346 for this module. Really did my best to be thorough and test different combinations of permissions, but I obviously couldn't test all of them.

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I just meant that I thought they were the one and the same. If they're not, then there do is a problem with the way you currently retrieve mailing lists for the "my account" panel.