Update credits.

Other minor changes.

to avoid confusion.
Added deuce to the blame.. er uh... authorship line.

(e.g. configurations for pre-v3.13 Synchronet), and added more step-by-step
instructions to further dummy-proof this doc.

releases and that we're now using Info-ZIP instead.

A. No.

restrictions (though the 'P' restriction should normally already be there).

host interoperability): %. expands to ".exe" on Win32, nothing on *nix.

upstreams are up to 48Kbps.