Add the generation of index files from the writer

See swift/swiftsim!1352 (merged) for more details.

• Update the example script in order to work with SPHENIX
• Add the missing Gil lock for the error message.
• The current version includes a few TODO related to future optimization (e.g. sorting). The code is already implemented in a way that will be easily upgraded.
• A huge bug was present in the reader. It was fixed with the i--.

added New Feature label

mentioned in merge request swift/swiftsim!1352 (merged)

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• cec85a6c - Fixes related to MPI

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• 134ab950 - Small fixes

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• 26e7c497 - Fix tests

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• d2980b32 - Fix large bug

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changed the description

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• 7af20378 - Cleanup

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marked this merge request as ready

mentioned in commit 62c0b356

merged