Function rstats::wv

pub fn wv<T>(v: &[T]) -> String where
    T: Copy + Display, 

Helper function write vector. Formats Vec as space separated values (ssv)
that can be Displayed without recourse to Debug. Saves space by using ssv instead of csv. This must be done in Rust item by item, hence the iteration. You can remove the green colour incantations at the beginning and at the end, if not wanted.