From Olivier:

TGraph2D is now split into 3 classes:

- TGraph2D (now in hist) to handle the basic graph 2d data
- TGraphDelaunay (in hist) to generate a Delaunay triangulation of a TGraph2D.
- TGraphPainter (in histpainter) to paint a TGraphDelaunay (used via
  THistPainter)
- New function GetContourList in TGraph2D
- New option CONT5: draws a TGraph2D as a contour (using Delaunay
  triangles).
- New TGraph2D constructor (from a TH2).

The class TSpectrum2 has been removed (still waiting for fixes from Miroslav)

NOTE: it is recommended to make distclean  make
or at least
 rm hist/src/G*  graph/src/G*


git-svn-id: http://root.cern.ch/svn/root/trunk@7998 27541ba8-7e3a-0410-8455-c3a389f83636