dune-grid is marked for autoremoval from testing

[Debian testing autoremoval watch]

dune-grid 2.5.0-1 is marked for autoremoval from testing on 2017-08-16

It is affected by these RC bugs:
867076: dune-grid: Build-dependency pgf no longer available

It (build-)depends on packages with these RC bugs:
867073: dune-common: Build-dependency pgf no longer available
867075: dune-geometry: Build-dependency pgf no longer available