test_presence: Add tests for various analytics pages.
test_presence: Add tests for various analytics pages.

While maybe these don't all belong in this test file, the overall
effect is that we now have quite good test coverage on
analytics/views.py.

It'd be nice to add some more assert statements for specific values
being present in the pages, but since we're not really working on that
part of the product, it's not a priority yet.

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