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Allowing any registered user to directly index urls is perhaps not greatly secure. Changed things so that only admins can index. But there is a new page allowing anybody (including unregistered visitors) to suggest urls to be indexed. This page has a little captcha associated with it. Suggestions are stored in a separate part of the database until an admin looks at them. Registered users retain additional rights, like commenting on urls.
Made categories (themes) visible to all users, so that people get an idea of what is included in the instance. But download and pod renaming can only be done by admins.
Also added CLI functions to rebuild the database from a backup. Flask Migrate was being too annoying.