major overhaul with new functions. docs are lacking

man/is_missing.Rd

@@ -0,0 +1,19 @@
+% Generated by roxygen2: do not edit by hand
+% Please edit documentation in R/doc2dd.R
+\name{is_missing}
+\alias{is_missing}
+\title{Multi missing check}
+\usage{
+is_missing(data, nas = c("", "NA"))
+}
+\arguments{
+\item{data}{character vector}
+
+\item{nas}{character vector of strings considered as NA}
+}
+\value{
+logical vector
+}
+\description{
+Multi missing check
+}