doris, triangle, and RC bugs

[Sebastiaan Couwenberg <sebastic@xs4all.nl>]

doris is scheduled for autoremoval from testing because it (build)
depends on triangle, which is affected by #988706.

While that issue is easy to fix, the triangle maintainer hasn't been
active since 2012 according to contributors.d.o. Removing the package
makes sense because of that.

doris should probably use its embedded copy of triangle and move from
contrib to non-free. Or be removed along with triangle. It has an
extremely low popcon score, so it likely won't affect many users.

Kind Regards,

Bas

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