__init__(): Avoid the costly scan of name in Utils.list_names(). This

resulted in a huge number of useless stats (i.e. list_lists or blank
listinfo could result in n**2 stats).  Instead, exceptions raised in
Load() are passed through the constructor, where essentially the same
checks are made anyway (caught by Ted Cabeen).

Load(): Several changes resulting from consistency in list-opening
exceptions:

    - If an IOError occurs when opening the list's config.db file,
      transform the exception into MMUnknownListError.  Also unlock
      the list before the exception is raised!

    - If the unmarshalled object is not a dictionary, raise
      MMCorruptListDatabaseError.  Again, unlock the list first.

    - If unmarshalling raises an EOFError, ValueError, or TypeError,
      transform these into MMCorruptListDatabaseError -- after
      unlocking of course.

IsListInitialized(): RAise MMListNotReadyError instead of
MMListNotReady.

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