Star Forest - SF

PETSc version 3.16.5

## Star Forest - SF:

PetscSF uses the concept of star forests to indicate and determine the communication patterns concisely and efficiently.

No beginner routines
Intermediate - Setting options for algorithms and data structures
| PetscSFCreateFromLayouts | PetscSFSetGraphLayout |
Advanced - Setting more advanced options and customization
| PetscSFCreateByMatchingIndices | PetscSFCreateSectionSF | PetscSFDistributeSection
Developer - Interfaces intended primarily for library developers, not for typical applications programmers
| PetscSFCreateRemoteOffsets | PetscSFSetGraphSection |
No deprecated routines

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