add rename to DockerFile

Docker/dolfin_dic-dev/Dockerfile

+# FEniCS base
 FROM quay.io/fenicsproject/stable:2019.1.0.r3
 
-RUN apt-get update; apt-get -y install python3-future python3-numpy; apt-get clean; rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+# basic stuff
+RUN apt-get update; apt-get -y install rename; apt-get clean; rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
 
+# python3 stuff
+RUN apt-get update; apt-get -y install python3-future python3-numpy python3-scipy; apt-get clean; rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+
+# vtk stuff
 RUN apt-get update; apt-get -y install libvtk7-dev python3-vtk7; apt-get clean; rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
 ENV CPATH="/usr/include/vtk-7.1":$CPATH
 
+# gnuplot stuff
 RUN apt-get update; apt-get -y install gnuplot git; apt-get clean; rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
 WORKDIR /home/fenics
 RUN git clone https://github.com/aschn/gnuplot-colorbrewer.git
 RUN echo "set loadpath \"/home/fenics/gnuplot-colorbrewer/diverging:/home/fenics/gnuplot-colorbrewer/qualitative:/home/fenics/gnuplot-colorbrewer/sequential\"" > .gnuplot
 
-RUN pip3 install git+https://github.com/dolfin-adjoint/pyadjoint.git@2019.1.0
-RUN pip3 install cma
-RUN pip3 install nlopt
+# optimization stuff
+RUN pip3 install git+https://github.com/dolfin-adjoint/pyadjoint.git@2019.1.0 cma nlopt
 
+# environment setup
 WORKDIR /home/fenics
 RUN mkdir code
 ENV PYTHONPATH=/home/fenics/code:$PYTHONPATH