function to draw stacked bar plots of nested data, such as timings of functions and their subfunctions
make eval_Cppdata general again and remove the plotting in physical units, leave it as comments!
mainly this adds plotting of mpcac and mpi plateaus to outputonline, it also changes the way the titles are constructed and adds many arguments controlling whether plots have titles, in addition, one can now optionally disable the naming of the pdf with trajectory interval used for the analysis