PETSc KspSolver and Sparse Matrix Fixes

Andreas Burkhartrequested to merge
burk/Merge_PETSc_KSPSolver_SparseMatrixFixes into master

Adds the PETScKSPSolver class, which can be configured via a PETScSolverOptions object and allows you to control the behaviour of PETSc Ksp solvers without using command line arguments.

Added a createEmptyCopy function to sparse matrix proxy classes.

Fixes memory leaks in PETScSparseMatrixProxy when using createMatrixFromProduct and createFromMatrixLinComb.

Includes additional minor changes to PETScLUSolver and PETScHDF5FunctionSave.

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