std.rational -- update and progress towards review

[Jacob Carlborg]

On 2013-10-03 16:36, Dicebot wrote:

> That is a bit frustrating part - we (reviewers) kind of want stuff
> cleanly separated between modules for further re-usage but at the same
> time we will make your life hell when reviewing how exactly this stuff
> needs to be incorporated :P

Every time I asked that some functionality should be place somewhere 
else because it's generally useable I just got a "No, we keep here, 
private, for now. We don't have a good public API for it".

-- 
/Jacob Carlborg