Merge pull request #248 from musella/fix_vbfanalysis_compilation

Fixed: VBF analysis not compiling after last commit
Fixed MINLO and sherpa xsections in jetanalysis/datafiles_vbfanalysis_minitrees.dat
Updated VBF optimization scripts to legacy reduction v5
Category optimization machinery updates:
- iterative scan
- tweak VBF optimization parameters
- add script to plot categorization results
Dump VBF and combined MVAs in VbfAnalysis minitrees