Paper size

[Graham Percival]

Why do we have this?

#(set-default-paper-size "a4")
-or-
\paper {
  #(set-paper-size "a4")
}

In fact, why not simply have
\paper {
  paper-size = "a4"
}


I have nothing against scheme expressions, but I don't see why the 
paper size (and global staff size) need scheme.  If we could define 
them like normal \paper or \layout variables, we could avoid some 
newbie confusion.

- Graham