Usability: order of process variables/components in input/output
It would be a great feature for the input as well as for the output to provide better information in order recognize the individual components of the process variables. E.g. it is apriori not clear to which compontent of which process variable a absolute tollerance of the nonlinear solver in the project file refers to. It is not the order as they appear in the inputfile, so an overview for every process might be helpful. Additionally, as they are defined by name in the project file, I think it would be nice if their name is also printed to output (instead of something like "Convergence criterion, component i:", "Convergence criterion, displacement comp. 1"). A similar problem occurs also in the .vtu output files: Whereas the order of the process variable components like displacement is somehow obvious, it is not for the stress tensor and it might be useful to add the exact component to the variable name or to give an overview of the order somewhere, so that not everybody needs to take a look at the source code first.