Add SymmetricTensor<2,4>::component_to_unrolled_index for the benefit of DataOutBase when outputting symmetric tensors.
Add SymmetricTensor<2,4>::component_to_unrolled_index for the benefit
of DataOutBase when outputting symmetric tensors.


git-svn-id: 31d9d2f6432a47c86a3640814024c107794ea77c@19760 0785d39b-7218-0410-832d-ea1e28bc413d

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