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Removes the need for two AttributeLists in DoubleEventSelector

Miha Muskinja requested to merge mmuskinj/athena:master-DoubleES-AttributeList into master

No longer creates two attribute lists in DoubleEventSelector. Now all contents of the secondary's input attribute list is copied to the primary attribute list with a suffix "_secondary". An additional bool is added to signal that the attribute list was extended: hasSecondaryInput.

Further, AthenaEventLoopMgr then gets an option to override the event number of the primary input with the event number from the secondary input. This was needed for MC+MC overlay as discussed in: ATEAM-512.

This also is related to ATEAM-510 and was discussed at the Core Software meeting on March 28 2019: https://indico.cern.ch/event/809488/

Edited by Miha Muskinja

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