B2OC EM: add variables to dv_simple.py and up polarity sample to info.yaml, Bd2DPi AP

Alessandro Bertolinrequested to merge
abertoli-run3-example into master

B2OC EM Analysis Production: Bd2DPi channel

add variables to dv_simple.py and up polarity sample to info.yaml

please do not delete the source branch

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