If more than one entry is given in `resolutions`, all pairs are being calculated in parallel. This is usefull if one is interested in the results
of the same usecase but calcuated for different mesh sizes h.
Notably, if `mesh_study` is `True`you should have most of the above commented out, and data for a mesh study is performed. Notably space-time errornorms are put out.
'''
>>>
**!Warning!**
Notably the last to pairs take a long time to calculate and memory shortage
might be an issue depending on your machine.
'''
>>>
-`starttimes = {0: 0.0}` starttimes gives a list of starttimes to run the simulation from.
The list is looped over and a simulation is run with t_0 as initial time
