Add pc fieldsplit #90
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and PETScNonLinearSolvers for supporting FieldSplit
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I have tried to extend the ability of the package to manage
PCFieldSplitoptions in PETSc forMultiFields.I have added the new ´IS´ PETSc type and several C functions for using the new type.
Looking at the code, I collect the global ID of the equations/dof for each processor of each field.
A new struct
PETScFieldSplithas been created. The user can easily specify the fields and a tag name to identify the fields,such as:
any constructive comments to improve/expand functionality are very welcome