HIGG1D2 - remove memory leak

Anthony Morleyrequested to merge
amorley/athena:HIGG1D2_Updates212 into 21.2

Removes a memory leak from HIGG1D2 and adds a option to add events with merged electron candidates (disabled by default). The changes made make no change to the derivations output size and CPU use (just remove the memory leak).

Edited by Anthony Morley

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