PLaces text as a title, xlabel, or ylabel on a group of subplots.
  Returns a handle to the label and a handle to the axis.
   [ax,h]=suplabel(text,whichLabel,supAxes)
  returns handles to both the axis and the label.
   ax=suplabel(text,whichLabel,supAxes)
  returns a handle to the axis only.
   suplabel(text) with one input argument assumes whichLabel='x'
 
  whichLabel is any of 'x', 'y', 'yy', or 't', specifying whether the 
  text is to be the xlable, ylabel, right side y-label, 
  or title respectively.
 
  supAxes is an optional argument specifying the Position of the 
   "super" axes surrounding the subplots. 
   supAxes defaults to [.08 .08 .84 .84]
   specify supAxes if labels get chopped or overlay subplots
 
  EXAMPLE:
   subplot(2,2,1);ylabel('ylabel1');title('title1')
   subplot(2,2,2);ylabel('ylabel2');title('title2')
   subplot(2,2,3);ylabel('ylabel3');xlabel('xlabel3')
   subplot(2,2,4);ylabel('ylabel4');xlabel('xlabel4')
   [ax1,h1]=suplabel('super X label');
   [ax2,h2]=suplabel('super Y label','y');
   [ax3,h2]=suplabel('super Y label (right)','yy');
   [ax4,h3]=suplabel('super Title'  ,'t');
   set(h3,'FontSize',30)