anchor.diff:  
   USER jovyan
   
  +# TODO: Update ipywidgets to 5.1*
   # Install Python 3 packages
   RUN conda install --quiet --yes \
       'ipywidgets=4.1*' \
  -    'pandas=0.17*' \
  +    'pandas=0.18*' \
       'numexpr=2.5*' \
       'matplotlib=1.5*' \
       'scipy=0.17*' \
  +    'lmfit=0.9*' \
       'seaborn=0.7*' \
  -    'sympy=0.7*' \
  -    'cython=0.23*' \
  +    'sympy=1.0*' \
  +    'cython=0.24*' \
       'bokeh=0.11*' \
  -    'h5py=2.5*' \
  +    'h5py=2.6*' \
       'nose=1.3*' \
  +    'brian2' \
  +    'brian2tools' \
       && conda clean -tipsy
   
   # Install Python 2 packages
   RUN conda create --quiet --yes -p $CONDA_DIR/envs/python2 python=2.7 \
  -    'ipython=4.1*' \
  +    'ipython=4.2*' \
       'ipywidgets=4.1*' \
  -    'pandas=0.17*' \
  +    'pandas=0.18*' \
       'numexpr=2.5*' \
       'matplotlib=1.5*' \
       'scipy=0.17*' \
  +    'lmfit=0.9*' \
       'seaborn=0.7*' \
  -    'sympy=0.7*' \
  -    'cython=0.23*' \
  +    'sympy=1.0*' \
  +    'cython=0.24*' \
       'bokeh=0.11*' \
  -    'h5py=2.5*' \
  +    'h5py=2.6*' \
       'nose=1.3*' \
  +    'brian2' \
  +    'brian2tools' \
       'pyzmq' \
       && conda clean -tipsy
   
  
positive.code: USER root
  
  # libav-tools for matplotlib anim
  RUN apt-get update && \
    apt-get install -y --no-install-recommends libav-tools && \
    apt-get install -y git \
                       gcc \
                       g++ \
                       gfortran \
                       libatlas-dev \
                       libatlas-base-dev \
                       libfreetype6-dev && \
    apt-get clean && \
    rm -rf /var/lib/apt/lists/*
  # Official Debian and Ubuntu images automatically run apt-get clean
  
negative.code: #USER jovyan
  
  #USER root
  
  ENV NDIR /opt/neuron
  ENV NRNPY python3
  