Master more new config fixes

The MuonCombined now gets through the configuraiton stage with:

python  -m MuonCombinedConfig.MuonCombinedReconstructionConfig

Unfortunately this does not yet run (i.e. add --run fails) and so I can't enable the test.

But this is new configuration, and so not executed anywhere yet, and it's important to get these fixes in so others can try to extend this work (and we don't get merge conflicts).

BTW the # from OutputStreamAthenaPool.OutputStreamConfig import OutputStreamCfg lines are commented out, but will be uncommented in a future MR very soon (as mentioned before, this is under rapid development).