sagemath is marked for autoremoval from testing

[Debian testing autoremoval watch]

sagemath 8.0-10 is marked for autoremoval from testing on 2017-12-15

It (build-)depends on packages with these RC bugs:
877210: normaliz: normaliz FTBFS on i386/armhf: Some error in the normaliz input data detected: Error while reading grading (a 1x2 matrix) !
880723: brial: FTBFS: Build-Depends on removed package libgd2-xpm-dev
881274: python3-flask-autoindex: broken symlinks: /usr/lib/python3/dist-packages/flask_autoindex/* -> ../../../../../share/python-flask-autoindex/*