detect when assigning PETSc vectors to each other when they are not compress()ed
detect when assigning PETSc vectors to each other when they are not compress()ed

git-svn-id: 31d9d2f6432a47c86a3640814024c107794ea77c@32464 0785d39b-7218-0410-832d-ea1e28bc413d

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