Update Openfoam tutorial for 2016.2 release

[wdm78]

The following method works:

• Launch a cluster with autoscaling disabled (MinNodes=0)
• Enable the volatile repo (http://docs.alces-flight.com/en/latest/apps/apps.html#volatile-gridware-repositories); comment out the “main” repo
• Run the following commands as your user (takes 45-mins to compile on c4 instance):

     pdsh -g cluster 'sudo yum -y install zlib-devel'
     alces gridware install main/mpi/openmpi/1.8.5 qlogic=false torque=false pmi=false pmilib=false sge=true
     alces gridware install libs/scotch
     alces gridware install libs/mgridgen
     alces gridware install openfoam/2.1.1
     alces gridware install paraview/4.3.1

To export built packages:

alces gridware depot export --ignore-bad local 

To import packages on another cluster:

for package in mpi-openmpi-1.8.5-el7.tar.gz libs-scotch-6.0.3-el7.tar.gz libs-mgridgen-1.0-el7.tar.gz apps-openfoam-2.1.1-el7.tar.gz apps-paraview-4.3.1-el7.tar.gz
> do
> alces gridware import $package
> done

pdsh -g cluster 'sudo yum -y install zlib-devel'

[vlj91]

Added the above changes to the OpenFoam tutorial.

Once OpenFoam versions 2/3 make it through to main as well as the supporting packages - we should once again update this to use a simple alces gridware install openfoam.

To-do once packages are in main:

• [ ] remove Alces customiser tool note
• [ ] replace install method