added octal numbers

[Arnegrnhgen]

I think that octal numbers can be used for different applications and are relevant for some applications. For example, our system needs octal numbers as input, which should determine Linux file permissions. I think that other developers can also benefit from this feature.

[crdoconnor]

This looks ok but needs a storytest. If you add one similar to some of the other scalar story tests I will merge it.