MG python systematics module for NLO, adding dynamic alternative scales to base fragment
Two changes to MadGraph systematic:
- Switching to python systematics module for NLO
- advantage: more flexible, easy to change pdfs after gp integration, consistent with LO (which should allow us to get rid of much of the MadGraphSystematicsUtils code once this is established)
- disadvantage: slower (2000evnts/min)
- Adding 'alternative_dynamic_scales' option to base fragment