We now use an `argparser` options instance for get_passphrase
instead of a bunch of single args. This makes the main function
`get_passphrase` less readable (you do not see immediately what
options are really expected), but avoids misleading defaults. We
now use the defaults set in argparser options, i.e. from
`handle_options()` as single source of defaults.

Move wordlists into the new package. This should fix
the data_files problem on most platforms and in most
environments.

Seems to be really tricky to install data files in a
foreseeable location.

The more finegrained solution of conorsch might be
slightly less stable in the long run, therefore we
selected the 'package', actually.