Install `gnuplot-nox`

It is used by a test in `dune-grid`.

Install `gnuplot-nox`
It is used by a test in `dune-grid`.
9a8c9539 · Ansgar Burchardt · c59b05ab · 9a8c9539 · 9a8c9539
Verified Commit 9a8c9539 authored Aug 25, 2016 by Ansgar Burchardt
--- a/base-8/Dockerfile
+++ b/base-8/Dockerfile
@@ -16,6 +16,7 @@ RUN apt-get update && apt-get dist-upgrade --no-install-recommends --yes \
  flex \
  gfortran \
  git \
+  gnuplot-nox \
  libadolc-dev \
  libboost-dev \
  libboost-program-options-dev \

--- a/base-9/Dockerfile
+++ b/base-9/Dockerfile
@@ -16,6 +16,7 @@ RUN apt-get update && apt-get dist-upgrade --no-install-recommends --yes \
  flex \
  gfortran \
  git \
+  gnuplot-nox \
  libadolc-dev \
  libboost-dev \
  libboost-program-options-dev \