Switch to using binary cpickles as the config file data format.

Marshal is not guaranteed to be compatible across Python versions, and
while I'm not aware of any breakage since Py1.5.2, better to be
defensive here.

Specific changes include:

__save(): Dump the dict to the file as a binary cPickle.  Do the dump
    directly instead of dumping a string to fp.write() since -- I hope
    -- cPickle doesn't suffer from the same problem as the comment
    describes marshal as suffering from (I don't actually remember the
    details of that).

__load(): Teach this method how to load .pck (i.e. config.pck) pickle
    files, but retain the ability to load .db marshal files for
    automatic upgrade.  Also, add a catch of cPickle.PicklingError to
    the big except clause.

Load(): Teach this how to load .pck and .db files, always defaulting
    to .pck first.  If the primary file was ever corrupt and we had to
    load from the .last file, we'll make a copy of .last to a .safety
    file just in case.

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