std.metastrings and Variadic CTFE funcs

[Daniel Keep]

Bill Baxter wrote:
> It just occurred to me when I woke up this morning that it should be
> possible to use a templated variadic function for Format instead of a
> template.  And looks that like what you're doing.  That's a much
> better approach.  I guess the only down side is that the CTFE memory
> leaks still exists.  But anyway, would you be willing to make your
> code available under the Boost license so it can be used in Phobos?

The license should be compatible with Boost; I changed it yesterday so
Eldar could use it for something.