work-in-progress on new datacard and combine tools
Full parsing and printing re-implemented
implemented improved filtering and much-simplified GetRate() function
Added simple GetShape() function, inline with the morphing done by combine
adding quick validation function, needs to be improved in the future
update CombineHarvester test code
adding low-budget code for plotting 1D NLL scans
added functions to extract sets and write datacards
fix compiler warnings and comment out validate function for now