Clarify interface for output file names in convergence tests.
I recently adapted my poisson system test to the command syntax. To make it work, I had to retrieve the naming scheme that the convergence test expected from the ctest error log file and adjust it. I have no idea, what the convergence test expects me to write the results to. I propose to use command syntax for this, just as for the test key. Say:
output = {bla}_{blub} | convergence_output
Is this feasible? I am not deep enough into the technicalities of the convergence tests to judge myself.