Upgrade from 0.6.0 to 0.6.1. Samba >= 3.5 is now required and
the use of gnome-ring was replaced with use of libsecret (now
off by default).

Make sure to use our native iconv-implementation and only use
glib20 at build-time for its built-in atomic macros.

Claim maintainership for now to deal with any fallout...