Order of subject parameters is wrong in 0.3 series

The order of subject parameters in 0.3 series is incorrect - notice that origin field is on index 3 in the python model, yet on index 4 in libzeitgeist:

zeitgeist/datamodel.py:

    Fields = (Uri,
        Interpretation,
        Manifestation,
        Origin,
        Mimetype,
        Text,
        Storage) = range(7)

src/zeitgeist-event.c: zeitgeist_event_to_variant():

      g_variant_builder_open (&b, G_VARIANT_TYPE ("as"));
      g_variant_builder_add (&b, "s", (bif = zeitgeist_subject_get_uri(su), bif ? bif : ""));
      g_variant_builder_add (&b, "s", (bif = zeitgeist_subject_get_interpretation(su), bif ? bif : ""));
      g_variant_builder_add (&b, "s", (bif = zeitgeist_subject_get_manifestation(su), bif ? bif : ""));
      g_variant_builder_add (&b, "s", (bif = zeitgeist_subject_get_mimetype(su), bif ? bif : ""));
      g_variant_builder_add (&b, "s", (bif = zeitgeist_subject_get_origin(su), bif ? bif : ""));
      g_variant_builder_add (&b, "s", (bif = zeitgeist_subject_get_text(su), bif ? bif : ""));
      g_variant_builder_add (&b, "s", (bif = zeitgeist_subject_get_storage(su), bif ? bif : ""));
      g_variant_builder_close (&b);

The same applies to from_variant method (otherwise the tests would be failing).