add option for saving other parameters to output in MultiDimFit
when redefinePOIs, also set the POIs to be non-constant
add doHZg doHInv to C7; and some naive implemtation of total width which is not correct
remove the total width implementaion
Merge pull request #121 from chenmingshui/NoOptimizeCachingNLL_ForRooExponentialWithMoreParameters

add option for saving other parameters to output in MultiDimFit