Support for nested fieldsplits #460
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This PR changes the way the fieldsplit is set up. So users can now use the functionality of PCFieldSplitSetFields https://petsc.org/main/manualpages/PC/PCFieldSplitSetFields/ indirectly, by using the command line argument "pc_fieldsplit_0_fields": "0,1" (for example). This allows grouping of certain fields together, allowing for nested fieldsplit solves in the fenics fashion
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Closes #459