make_folds: Helper function for making fold IDs for cross validation.
Description
Helper function for making fold IDs for cross validation.
Usage
make_folds(nsamp, nfold, cv_fold_seed)
Value
A list of nsamp vectors, numbers 1 to nsamp shuffled and grouped into vectors of length floor(nsamp/nfold) followed by vectors of length floor(nsamp/nfold)+1.