6tunnel-0.13-bp155.3.7

- add 9e4119f03f57eec67b97dddbf09d363b638791dc.patch to be
  able to switch to python3

- Update to version 0.13
  * Updated help message.
  * Avoid segfault in "-f" mode.
  * Support automake's "make check" target.
- Run testsuite

- Generalize description.

- Initial package for 6tunnel, version 0.12