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9ec4f7e44a
1. Rename BlockJacobiPreconditionet to BlockSparseJacobiPreconditioner. 2. Add CompressedRowSparseJacobiPreconditioner which is a block Jacobi preconditioner for CompressedRowSparseMatrix objects. 3. Re-write the tests to be more comprehensive. Change-Id: Icbc91f9ad2cefaad593c11397f8cdcf805d7e118