Add question about stating changes to the original.

I was starting to get myself all confused, so I had to map this out on a
whiteboard.  I've got a good linear path now, and this is part of it; dealing
with "I'm not sure about this question" jumps will be more interesting.
Reorganize license table in README.
Add WTFPL ending.
Reformat strings.

At first, I kept long strings all on one line - usually that's easier when
putting together sentences.  It turns out, though, that Ren'Py will strip out
the extra spaces, so hard-wrapping is a-ok.

And then when I figured that out, I was hard-wrapping to the same indent level,
which is just silly.

So fix both of those - hard wrap and indent in.
Move GPL decision tree out.

It was way too indented in, and making the copyleft label too complicated.
Split that shit out.
Ask about advertising.

And that's it - we've now got all ends tied up, so I've just got to make it
support non-linear progression, and add backgrounds, and change the pictures,
and add more pictures, and give the license text at the end, and... well, I'll
just file a bug titled "Polish".