Commit 18883681a2 reordered the methods. Although the convention in
the `racket/draw' manual is to order methods alphabetically,
alphabetical does look strange for `color%', and I've refined the
non-alphabetical order to one I like even more.
Also, use keywords for `make-pen' and `make-brush'.
Adding `make-pen' and `make-color' creates many conflicts among
teaching libraries, such as `2htdp/image'. These are easy to fix
up in the tree, but adding such obvious names to `racket/draw'
may create other compatibility problems, so we might have to reconsider
the names.
In consultation with Asumu.
