Giulio Eulisse

Updated from @ChSonnabend PR #5622. One needs bfd78a7c8bbfb9725b232573a8d4066b0361d53b and 405f18fe37eb828e90e5cb697440a83afbe33b21 for it to behave.

Bump m4 to 1.4.19

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Fixes build on vanilla RHEL9 with GCC11

Allow users to use a virtualenv as own python

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Notice that it will still try to install our own provided packages so that we have a minimum working environment.

Demonstrate usage of macOS keychain to store passwords

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In case you are interested, this is what I use to store the password in the macos keychain. While it should not be complicated, my haskell-fu is not large enough...

Change in behaviour in `TTreeReaderValueBase::GetSetupStatus()`

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### Check duplicate issues. - [x] Checked for duplicates ### Description We have another regression in 6-36-00, where an exception is not raised anymore when trying to open a TTree...

Segmentation fault while running interpreted macro

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### Check duplicate issues. - [x] Checked for duplicates ### Description One of our unit tests breaks with: ``` Test project /Users/ktf/src/sw/BUILD/O2-latest/O2 Start 190: Detectors/CTP/macro/GetAndSave.C 1/1 Test #190: Detectors/CTP/macro/GetAndSave.C ...***Failed...

ROOT fails to instantiate an object

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### Check duplicate issues. - [x] Checked for duplicates ### Description Using: ``` void foo () { o2::dcs::DataPointValue value; } ``` results in the error below when running it with...