More paper sizes #80
Description
I'd like to output to other paper sizes. Even though it's documented that most sizes don't work, I'm a bit confused why I'm seeing an error message, in practice. For example, paps can't recognize even A5.
Looking at the source, I thought you're printing an error if paperinfo from libpaper can't recognize a size, but my system libpaper definitely knows about that (paper --all).
What am I getting wrong?