o Major bugfixes (windows, startup):
    - When writing a consensus file to disk, always write in
      "binary" mode so that we can safely map it into memory later.
      Fixes part of bug 28614; bugfix on 0.4.0.1-alpha.
    - When reading a consensus file from disk, detect whether it
      was written in text mode, and re-read it in text mode if so.
      Fixes part of bug 28614; bugfix on 0.4.0.1-alpha.