Elements in precice-config.xml need to be in specific order

[MakisH]

In the current develop, the aste-turbine case does not work with the config-visualizer, because the m2n tag is defined before the participants tags:

https://github.com/precice/tutorials/blob/254f8247afe555e7cffc3ecc20e30a40620cd645/aste-turbine/precice-config.xml#L22-L27

Instead of a useful error message, I get:

~/repos/precice/tutorials/aste-turbine [add-config-visualizations]$ preciceToPNG
Traceback (most recent call last):
  File "/home/gc/.local/bin/precice-config-visualizer", line 8, in <module>
    sys.exit(main())
  File "/home/gc/.local/pipx/venvs/precice-config-visualizer/lib/python3.10/site-packages/preciceconfigvisualizer/cli.py", line 65, in main
    dot = configFileToDotCode(args.infile, args)
  File "/home/gc/.local/pipx/venvs/precice-config-visualizer/lib/python3.10/site-packages/preciceconfigvisualizer/common.py", line 437, in configFileToDotCode
    g = configToGraph(xml, args)
  File "/home/gc/.local/pipx/venvs/precice-config-visualizer/lib/python3.10/site-packages/preciceconfigvisualizer/common.py", line 299, in configToGraph
    lhead=participantClusterName[pto],
KeyError: 'A'

Moving the m2n tag after the participant tags works (implemented in precice/tutorials#514).

I guess the config-visualizer should not care what order the tags are defined in, but if it cares, an error would be helpful. In any case, not so important, as we should write our config files "tell a story". But it could confuse users.

[fsimonis]

Fixed in 9b756d1

We now process elements in a fixed order.