Add RootCnvSvc option to write ROOT files in 'forward compatibility' mode

This makes files written with ROOT 6.30, although technically incorrect, to be read by unpatched ROOT 6.24.

See https://github.com/root-project/root/issues/14793

Closes #303 (closed)

changed milestone to %v38r2

added lhcb-gaudi-head lhcb-lcg-dev3lhcb lhcb-lcg-dev4lhcb labels

/cc @cburr

• [2024-04-06 00:04] Validation started with lhcb-lcg-dev3lhcb#428

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• [2024-04-06 00:09] Validation started with lhcb-run2-gaudi-head#736
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• [2024-04-12 00:36] Validation started with lhcb-gaudi-head#3882
• [2024-04-13 00:03] Validation started with lhcb-lcg-dev3lhcb#429
• [2024-04-13 00:03] Validation started with lhcb-lcg-dev4lhcb#438
• [2024-04-13 00:03] Validation started with lhcb-gaudi-head#3883
• [2024-04-13 00:36] Validation started with lhcb-gaudi-head#3883
• [2024-04-16 00:04] Validation started with lhcb-gaudi-head#3884
• [2024-04-16 00:24] Validation started with lhcb-run2-gaudi-head#739
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• [2024-04-17 00:09] Validation started with lhcb-run2-gaudi-head#740
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• [2024-04-19 00:20] Validation started with lhcb-run2-gaudi-head#742
• [2024-04-20 00:04] Validation started with lhcb-gaudi-head#3888
• [2024-04-20 00:11] Validation started with lhcb-lcg-dev3lhcb#430
• [2024-04-20 00:13] Validation started with lhcb-lcg-dev4lhcb#439
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• [2024-04-22 00:19] Validation started with lhcb-run2-gaudi-head#744

mentioned in issue lhcb-simulation/lbmcsubmit#79

assigned to @clemenci

approved this merge request

merged

mentioned in commit f2f71809

mentioned in issue lhcb/Moore#767 (closed)