- In ComputeZ: Wrong zeros may appeared when points sit on a regular grid.   This problem is now fixed. It showed when a TGraph2D was plotted with option   "surf1" for instance. Some peaks were visible in random places on the   surface.
- In ComputeZ: Wrong zeros may appeared when points sit on a regular grid.
  This problem is now fixed. It showed when a TGraph2D was plotted with option
  "surf1" for instance. Some peaks were visible in random places on the
  surface.


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@15292 27541ba8-7e3a-0410-8455-c3a389f83636

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