Receive key stanza and sort the rows so that the missing values are last in the list. Leaves ordering of other rows unchanged otherwise.
sortStanza(keyblock, valvar = "value_new", na.strings = c("\\.", "",
"\\s+", "N/A"))
a variable key, or section of rows
Default is "value_new", the column for sorting.
Stings to be treated as missing, along with R's NA symbol
keyblock, row re-arranged with missings last