Load necessary packages needed for the python optclim package

To use this version of OptClim use Python2.7, and load the packages pandas, numpy, scipy and netCDF4

When running on a supercomputing cluster, you can create a conda environment, load the necessary python packages into it,
save the environment, then load it later just before calling optclim (this saves having to load the packages every time).

e.g. On the ARC supercomputing cluster, Oxford University (https://www.arc.ox.ac.uk/using-python-arc)

# Create environment (you only need to do this once)
module load python/anaconda2/5.0.1
export CONPREFIX=$DATA/myenv
mkdir $CONPREFIX
conda create --prefix $CONPREFIX --copy python=2.7
source activate $CONPREFIX

# Load packages to environment (you only need to do this once)
pip install pandas
pip install numpy
pip install scipy
pip install netCDF4==1.4.0

# Deactivate environment
source deactivate

# Load it later when ready to run optclim
module load python/anaconda2/5.0.1
source activate $DATA/myenv

