Possible feature for Delphes inputs

Hello,

To support more inputs for Delphes in the key4hep, it would be good to provide inputs in the form of ProMC files used in https://atlaswww.hep.anl.gov/hepsim/

This requires a few steps:

- Install ProMC file format https://atlaswww.hep.anl.gov/asc/wikidoc/doku.php?id=asc:promc:installation somehere in Key4hep
- Make sure $PROMC environmental variable is available (after installation). I tested the intallation - it works fine.
- Recompile Delphes (do "configure" first). Delphes script automatically will pick up the variable $PROMC and will create DelphesProMC binary file. Then one can create DelphesPROMC_EDM4HEP.

best, Sergei

Start by reviewing the Delphes configure flow and script to see where the PROMC environment variable is detected and how DelphesProMC is produced. Verify the ProMC installation and confirm that the resulting DelphesPROMC_EDM4HEP input can be generated in Key4hep.

Written by the indexing model from the issue text.