Run PMA::CCA.permute.both permutations in parallel
x.CCA.permute.both(x, z, typex, typez, penaltyxs, penaltyzs, niter, v,
trace, nperms, standardize, chromx, chromz, upos, uneg, vpos, vneg,
outcome, y, cens, verbose = TRUE, n.cores = rtCores,
parallel.type = ifelse(.Platform$OS.type == "unix", "fork", "psock"))