[datatable-help] minor formatting issue

[eddi]

When joining vs not-joining the order of the key column is different in the
output:

> dt = data.table(a = c(1:4), b = c(1:4), key = "b")
> dt[J(1)]
   b a
1: 1 1
> dt[!J(1)]
   a b
1: 2 2
2: 3 3
3: 4 4

I don't usually care about column order, but this could become a surprise
issue for people reading/writing to files.



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