Re: Shift operation for array elements

[Krux02]

I would call it transform like in `std::transform` from c++ `<algorithm>`. But 
then it should also rotate elements, meaning that elements dropping out from 
the left, should also reenter from the right. And to complete the functionality 
of std::transform, it should also be possible to pass subranges of a seq to 
this procedure. But I think that's a language feature that is still missung 
(because `seq` is a language feature and not just standard library).