getopt upgrade

[Andrej Mitrovic]

On 1/3/14, Andrej Mitrovic <andrej.mitrovich at gmail.com> wrote:
> I have a simpler idea, and I'm already working on the following features:

I've settled for a slightly different API w.r.t. the header/footer
configuration, but otherwise I've made the pull here:

https://github.com/D-Programming-Language/phobos/pull/1840

I'm still open to suggestions if someone doesn't like the API.