randomTrips.py: patch comment header of output files processed by duarouter

[namdre]

when running randomTrips with option --validate the trips are processed by duarouter and the fact that they were created by randomTrips.py is no longer retrievable from their header. (The same applies when generating route output with option -r)

[behrisch]

maybe having both headers is even more useful

[behrisch]

@bcoueraud87 for you

[bcoueraud87]

@behrisch yes, please assign me

[namdre]

@bcoueraud87 only the part "The same applies when generating route output with option -r" is still missing.

[namdre]

@behrisch Do you see a feasible way of testing this with texttest? I mean, can we overwrite the run_dependent_text setting for a single test? We still need to filter out the timestamp but could keep the rest of the header comment since it's all relative paths.

[behrisch]

No, I don't think so but just try it out