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21.6 add prophecy4f and hto4l

Migrating Prophecy4f and Hto4l from release 19 to 21.6.

For things to work fully, one will need to migrate changes for externals in: this tag to be used in 21.6 so that the external packages for prophecy4f and Hto4l can be picked up from LCG.

But I have tested bypassing this with:

asetup 21.6,AthGeneration,latest --envvarsNotSet=LCG_RELEASE_BASE

Note also that there is an outstanding bug report here, where is appears that Pythia is changing the decayed four leptons 1% of the time which affects the reconstructed mass. This will need to be resolved before any production might be done. But this shouldn't affect adding this MR into the nightly.

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