This function converts labelled class vectors
into a generic data format, which means that simply all labelled
class attributes will be removed, so all vectors / variables will most
likely become atomic.
unlabel(x, verbose = TRUE)A data frame, which contains labelled class
vectors or a single vector of class labelled.
Logical, if TRUE, a progress bar is displayed that indicates
the progress of converting the imported data.
A data frame or single vector (depending on x) with common object classes.