o Minor bugfixes (fallback directory selection):
    - Avoid errors during fallback selection if there are no eligible
      fallbacks. Fixes bug 19480; bugfix on ba76910 and 78ec782 in
      0.2.8.3-alpha. Patch by teor.
  o Minor features (fallback directory list):
    - Update hard-coded fallback list to remove unsuitable fallbacks.
      Resolves ticket 19071. Patch by teor.
    - Add a comment to the generated list that explains how to comment-out
      unsuitable fallbacks in a way that's compatible with the stem fallback
      parser.
    - Update fallback whitelist and blacklist based on relay operator
      emails. Blacklist unsuitable fallbacks. Resolves ticket 19071.
      Patch by teor.