1) Adding profiling of MH mu mode (also default now to profile MH for all models)
2) Adding 4-production model as RProcScan
3) Allowing mu to also be r_X in plotter (--xlab and --xvar options to pick up poi's != 'r' in the tree)
Merge pull request #396 from nucleosynthesis/nckw-production-modes-in-combineHarvester

Add per-process scans to combineHarvester