Fix bug in in CutSample.m that led to wrong number of draws for moment computation (first part of PR #733)

FirstLine actually defined the last line. One needs to 1. Otherwise,
Draws in GetAllPosteriorDraws.m will be (NumberOfDraws+1)*nblck.
Fixes ambiguity in the output of CutSample routine (second part of PR #733).
Merge branch 'cut_sample'