Requiring schemes in Gemini requests

[Sean Conner]

It was thus said that the Great Arav K. once stated:
> > I think I'm happy with this, does anybody object?
> 
> No, this is a great idea.  It's also been confusing a lot of people
> (iirc) about what is a valid URL without a scheme (e.g. //example.com)
> so making it absolutely clearly is a win.

  I've gone ahead and removed the schemeless support from GLV-1.12556 in the
hopes this pushes other people to do the same, and get Solderpunk to update
the specification.

  -spc