This function creates barplots to display the number of suppressed values
in categorical key variables to achieve k-anonymity.
# S3 method for localSuppression
plot(x, ...)object of derived from localSuppression()
Additional arguments, currently available are:
"showDetails": logical, if set, a plot of suppressions by
strata is shown (if possible)
a ggplot plot object
data(francdat)