return the columns that create data viz in the outlier plot

[dendroica]

suggest adding the columns that weight the blue lines and the points so it is easier to see in the output data frame which points they correspond to

[dendroica]

I edited this in my own code copy because I found the feature useful to more quickly be able to identify the points being visualized as outliers; I think it might help others find them more quickly too

[chfleming]

Thanks @dendroica

For lwd, the values correspond to the n-1 intervals between points and not the n points themselves, and so there is one fewer, which you padded with a zero. I think that could cause confusion to users.

I will probably add a verbose option to turn this on and then change the padding to NA to avoid confusion.

[dendroica]

awesome, thanks for the consideration and good call re: NA value for padding the vector :)