Can run the example using the command ./particles 365 1 ../init.csv planet 1 from the build folder. From C++ the gravitational constant G must be changed accordingly.
The trajectories can be viewed using Paraview, and we observe trajectories as expected. Except for Mercury.
See the file python_functions.py. Note that we assume 5 integers in the filenames (not 4 as in the trajectory folder). We can easily rename multiple files using the command rename 's/step-0/step-00/g' * in order to get same naming convention.