DMD 1.036 and 2.020 releases

[dsimcha]

== Quote from John Reimer (terminal.node at gmail.com)'s article
> Hello Andrei,
> > I think the entire operator paraphernalia is due for a serious
> > overhaul.
> >
> > Andrei
> >
> This may not be a popular opinion, but I agree!
> -JJR

I'll second that.  D's operator overloading is a bit confusing because it's kind
of grown rather than having been designed.  This should be fixed now, while
breaking changes are still considered acceptable.