Error RPSS

Hi @vagudets,

I have updated the master branch and I am getting the error:

> source("modules/Crossval/Crossval_metrics.R")
skill_metrics <- Crossval_metrics(recipe = recipe, data_crossval = res,
                                fair = FALSE, nmemb = NULL, nmemb_ref = NULL)
Error in .RandomWalkTest(skill_A = rps_exp[ind_nonNA], skill_B = rps_ref[ind_nonNA],  : 
  unused argument (N.eff = N.eff)

It could be because I am using 'tos' which has NA's?

Thanks,

Núria