Restored primary vertex branch in event-based reconstruction. Refs #2096.

With MR310, the primary vertex branch was removed from event-based reconstruction. This created problems, since many analysis tasks do not yet read from the event objects, but access the primary vertex branch (single object) directly. For the RC APR21, a fix was introduced to cope with this. One primary vertex object per tree entry is again created. In case there are several events in the entry, the branch object corresponds to the vertex of the first event.

changed milestone to %APR21

added Framework label

added 2 commits

• 5a3d5bfd - 1 commit from branch computing:master
• 2d11c5b0 - Restored primary vertex branch in event-based reconstruction. Refs #2096.

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Dear @f.uhlig, @v.friese, @p.-a.loizeau,

you have been identified as code owner of at least one file which was changed with this merge request.

Please check the changes and approve them or request changes.

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merged