Proposal about content-size and hash

[Sean Conner]

It was thus said that the Great Sean Conner once stated:
> 
> 	gemini://gemini.conman.org/test/testsize.gemini
> 
>   The above page will return a normal 20, but all the links on it will
> return a 22 with a size, then MIME type.

  The above page no longer exists.  It's clear that this method (using a
separate status code to signal size data) is not popular (and I wasn't even
a fan of it myself).

  -spc (Will remove dodgy proof-of-concepts on a whim for $400, Alex)