Implement the following changes in TGraph::Draw   -when option "same" is specified it is ignored   -when option "a" is specified the pad is cleared
Implement the following changes in TGraph::Draw
  -when option "same" is specified it is ignored
  -when option "a" is specified the pad is cleared


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@19623 27541ba8-7e3a-0410-8455-c3a389f83636

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