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MET EDM: Change stored doubles to floats

William Keaton Balunas requested to merge wbalunas/athena:metFloats-201105 into master

This replaces MET EDM variables which are stored as doubles to floats (see ATLASRECTS-5205). The point of this is to save space in memory/xAODs; the effect on physics performance has been looked at and found to be negligible.

Tagging @khoo for a sanity check to make sure I didn't miss something, also @sawyer, @cdelitzs, @mswiatlo for their awareness.

Edited by William Keaton Balunas

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