The default values for S.filter.number and S.family in the TLSW() function
have been changed to T.filer.number and T.family respectively.
The default value for the plot.CI argument in plot.TLSW() has now been removed.
If a CI was calculated for the trend, it will be plotted by default, unless the
user sets plot.CI = FALSE. In addition, plot.TLSW() now warns the user if
argument plot.CI = TRUE but no confidence interval was calculated.
Fixed issue in plot.TLSW() where data was not displayed in trend plot when
confidence interval not requested.