- Line2D, Text, and Patch copy_properties renamed update_from and
  moved into artist base class
- LineCollections.color renamed to LineCollections.set_color for
  consistency with set/get introspection mechanism,
- pylab figure now defaults to num=None, which creates a new figure
  with a guaranteed unique number
- contour method syntax changed - now it is MATLAB compatible
    unchanged: contour(Z)
    old: contour(Z, x=Y, y=Y)
    new: contour(X, Y, Z)
  see http://matplotlib.sf.net/matplotlib.pylab.html#-contour
 - Increased the default resolution for save command.
 - Renamed the base attribute of the ticker classes to _base to avoid conflict
   with the base method.  Sitt for subs
 - subs=none now does autosubbing in the tick locator.
 - New subplots that overlap old will delete the old axes.  If you
   do not want this behavior, use fig.add_subplot or the axes
   command