  o Minor bugfixes:
    - Correctly store microdescriptors and extrainfo descriptors with
      an internal NUL byte. Fixes bug 8037; bugfix on 0.2.0.1-alpha.
      Bug reported by "cypherpunks".

  o Minor features:
    - Reject as invalid most directory objects containing a
      NUL. Belt-and-suspender fix for bug 8037.
