reversal of axis in spy

[David Bateman]

With the changes for the graphic handles, spy had its y axis reversed.
This patch puts things back to normal..

D.

Index: scripts/sparse/spy.m
===================================================================
RCS file: /usr/local/cvsroot/octave/scripts/sparse/spy.m,v
retrieving revision 1.6
diff -c -r1.6 spy.m
*** scripts/sparse/spy.m        23 Mar 2007 21:20:21 -0000      1.6
--- scripts/sparse/spy.m        7 May 2007 16:17:09 -0000
***************
*** 35,40 ****
      plot (j, i, ".");
    endif
  
!   axis ([0, n+1, 0, m+1]);
  
  endfunction
--- 35,40 ----
      plot (j, i, ".");
    endif
  
!   axis ([0, n+1, m+1, 0]);
  
  endfunction