[arch-general] arch health

[Carsten Mattner]

If I may suggest a pain point: arch needs good support for
revoking packages and replacing with the previous version
if regressions are encountered. Case in point ffmpeg 3.3.
3.2.4 was fine and 2.8.11 is also fine but 3.3's muxer
corrupts files. It's not the first instance where I wished
for official revoke and replace in the index instead of
manual user intervention.