initial migration mgamc 2.2.1 and lhapdf6 plus additional (WIP) example cards
additional changes for mgamc 2.2.1 and lhapdf6 migration
remove unneeded cards and rename to reflect contents more clearly
make card names and models consistent
last card name fix
add additional example cards for 4flavour scheme with matching
remove superseded scripts
update cmssw default releases (only ones that have or will have the proper lhapdf6 external)
Merge pull request #147 from bendavid/mgamc2_2_1_lhapdf6

Migration to mg_amc 2.2.1 and lhapdf6 (and remove old scripts)