[Run2_2017] V16 weightProducer Fixes for Summer16MiniAODv3 samples
Created by: aperloff
This commit:
- Adds new neff dictionaries to condorSub
- Adds new getWeightProducer lines for the Summer16MiniAODv3 datasets
- Fixes the format of the Summer16MiniAODv2 datasets with negative weights
- Adds new unit tests
- Adds/updates some cross sections