Rename a few variables. Initialize vectors with vector sets and communicators, rather than other vectors, to make clear that the vector is not in fact copied, and to make it clearer what index set is being used.
Rename a few variables. Initialize vectors with vector sets and communicators, rather than other vectors, to make clear that the vector is not in fact copied, and to make it clearer what index set is being used.

git-svn-id: 31d9d2f6432a47c86a3640814024c107794ea77c@31105 0785d39b-7218-0410-832d-ea1e28bc413d

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