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Fix VP11 negative event numbers while creating new files, when event numbers reach the "int" limit

Riccardo Maria Bianchi requested to merge rbianchi/athena:master-fix-vp1-negativeEvtNumber into master

This MR fixes the negative event numbers observed while creating new files, when the event numbers are large enough to reach the "int" limit.

So, now I moved the event number in {{VP1FilesUtilities}} from {{int}} to {{unsigned long long}}.

That was fixed in several VP1 classes before, and in VP1AlgsEventProd recently (), but that new issue has been found by @lshi, only when enabling the single-event ESD production at P1:

https://atlasop.cern.ch/elisa/display/453544?logbook=ATLAS

This MR fixes that issue and solves ATLASVPONE-569.

NOTE: Hopefully, this MR can be merged into the new release for P1, we need this fix for the onlineEventDisplays single-event ESD production.

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