Add support for variable bin size axis in TH3 functions:   TH3::ProjectionZ   TH3::Project3D In the case of Project3D, only projections to 1-D histograms support the case of variable bins.
Add support for variable bin size axis in TH3 functions:
  TH3::ProjectionZ
  TH3::Project3D
In the case of Project3D, only projections to 1-D histograms support the case
of variable bins.


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@207 27541ba8-7e3a-0410-8455-c3a389f83636

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