Add Poetest and its documentation

put takedraws and getalldraws functions into the poetest function such that everything makes sense with roxygen and the documentation; add option to use the robust variance covariance matrix; update to version 0.3.3

R/poetest.R

@@ -17,11 +17,6 @@
 #' poeresults<-poetest(n=5000, model1 = clmodels[[model_1]],model2 = clmodels[[model_2]],
 #'  att=attr, price = "bcost")
 #' }
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 poetest <- function(n, model1, model2, att, price){