Implement an iterative Poisson solver #69
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pbartholomew08
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Still to be tested in parallel
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This will disable iterative solver support
The high-order operator is implemented entirely in x3d2 code, the low-order (preconditioner) requires PETSc - therefore we should at least ensure the high-order operator is always tested
Currently this only supports BC_PERIODIC (however in principle any should be supported)
A few odd indentation results we killed - potentially due to long lines
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This is based off the Poisson branch #32 and adds the interface to PETSc as an alternative Poisson solver.