Plot timestep duration

We provide a simple python script to generate plots of the timestep duration from the stdandard output of WarpX (provided that warpx.verbose is set to 1):

If the standard output of a simulation has been redirected to a file named log_file, the script can be used as follows:

python log_file

The script generates two pictures: log_file_ts_duration.png, which shows the duration of each timestep in seconds as a function of the timestep number, and log_file_ts_cumulative_duration.png, which shows the total duration of the simulation as a function of the timestep number.