[docs] Minor suggestion for "Curses Programming with Python"

[driscoll at cs.wisc.edu]

I was reading the page at http://docs.python.org/howto/curses.html, which
contains the following paragraph:

   A word about the coordinate system used in curses: coordinates
   are always passed in the order y,x, and the top-left corner of
   a window is coordinate (0,0). This breaks a common convention
   for handling coordinates, where the x coordinate usually comes
   first. This is an unfortunate difference from most other computer
   applications, but it’s been part of curses since it was first
   written, and it’s too late to change things now.

But there's one other case where (y,x) ordering is very common: elements
of a matrix are almost always named by row before column (with the upper
left at 0,0). Further, the curses screen in some sense is closer to a
(rows x cols) matrix than it is to a regular coordinate field since the
individual 'points' are so huge.

I think it might be helpful to make this analogy. Something like the
following:

   If it helps, you can think of the screen as a matrix instead
   of the Cartesian plane, and the coordinates as (row, column)
   rather than a reversed version of (x, y).


Evan