add ability to bypass frequenist fit (in case eg. input snapshot already corresponds to S+B fit), and also to force override of snapshot mass from the command line (changes in general to allow post-fit expected with b from global S+B floating mu-mh fit)
Merge pull request #86 from bendavid/postfitExpected

add ability to bypass frequenist fit (in case eg. input snapshot already...
merge master updates into development