Add a new tutorial treefriend.C // This tutorial illustrates how to: //   - create a simple TTree //   - Copy a subset of this TTree to a new TTree //   - Create a Tree Index //   - Make a friend TTree //   - compare two TTrees //   - Draw a variable from the first tree versus a variable //     in the friend Tree
Add a new tutorial treefriend.C
// This tutorial illustrates how to:
//   - create a simple TTree
//   - Copy a subset of this TTree to a new TTree
//   - Create a Tree Index
//   - Make a friend TTree
//   - compare two TTrees
//   - Draw a variable from the first tree versus a variable
//     in the friend Tree


git-svn-id: ecbadac9c76e8cf640a0bca86f6bd796c98521e3@9442 27541ba8-7e3a-0410-8455-c3a389f83636

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