Merge branch 'scaling-plots' into 'master'
Scaling plots Added code to create an extra output file that contains timing information for every timestep. The output file also contains a header that includes: branch, Git revision, compiler version, number of threads, number of MPI ranks, hydro scheme, hydro kernel, no. of neighbours and eta. Added two parameters to cosmoVolume.yml that are used to create a file for the energy output per timestep and timing information. Also added a python script that plots scaling results for varying numbers of threads and data series. See merge request !197