First go at NOT groups
Adding ability to group nuisances NOT in a specfic group
run --freezeNuisanceGroup ^name to freeze all nuisances
not in group "name"

Additionally fixed a bug causing a crash when using freezeNuisanceGroup
accessing the mc_bonly

Some print out for when an unkwon group is asked for
Merge pull request #154 from nucleosynthesis/nckw-add-NOT-nuisance-groups

Added possiblity to freeze nuisance that are not in a group.