templates/filters: add doctest to the 'person' filter Add a doctest with an hopefuly-comprehensive list of combinations we can expect in real-life situations. This does not cover corner cases, for example when a CR or LF is embedded in the name (allowed by RFC 5322!). Code in tests/test-doctest.py contributed by: Martin Geisler <mg@aragost.com> Thanks! Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>