Run PMA::CCA.permute permutation in parallel
x.CCA.permute(x, z, typex = c("standard", "ordered"),
typez = c("standard", "ordered"), penaltyxs = NULL,
penaltyzs = NULL, niter = 3, v = NULL, trace = TRUE,
nperms = 25, standardize = TRUE, chromx = NULL, chromz = NULL,
upos = FALSE, uneg = FALSE, vpos = FALSE, vneg = FALSE,
outcome = NULL, y = NULL, cens = NULL, verbose = TRUE,
n.cores = rtCores)