For XDF the contents() and rxSummary() suggestions

[Graham Williams]

Rattle Explore -> Summary -> Summary results in a call to contents()

contents(crs$dataset[crs$sample, c(crs$input, crs$risk, crs$target)])

This should be the XDF dataset and not the crs$dataset. We want to eventually replace all operations on crs$dataset with crs$xdf.

Also rxSummary() is then used and I would suggest we use summary() instead for the same output but more standards friendly.

[Graham Williams]

Remove contents() and only use summary().