PetscSF: define guard for MPI_COMBINER_NAMED

Necessary to avoid build errors with mpiuni.

PetscSF: clean up example syntax

PetscSF: Hook up ex3 to test examples

PetscSF: Add example using derived data types

PetscSF: Free newly allocated MPI datatype objects

If the returned types from MPI_Type_get_contents are derived
datatypes (or dupped from base types) then the caller is responsible for
calling MPI_T

PetscSF: Free newly allocated MPI datatype objects

If the returned types from MPI_Type_get_contents are derived
datatypes (or dupped from base types) then the caller is responsible for
calling MPI_Type_free on them.

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Merge branch 'maint'

add missing PETSC_EXTERN to custom Fortran wrappers

Merge branch 'barry/fix-some-clang-warnings'

Merge branch 'barry/fix-source-clang'

Merge branch 'barry/make-functions-static'

fixed some naming spacing problems, some visibile function problems

changed findvisibleprivatefunctions to use shared library since static library still exposes PETSC_INTERN functions

fix compile warning

A few corrections for items detected by the clang static analyzer

Reported-by: clang static analyzer

fix a variety of set but not used detected by clang static analyzer

add ierr and return ierr; to many PetscFinalize() in examples
add ierr and if (ierr) return ierr; to some PetscInitialize() in exa

fix a variety of set but not used detected by clang static analyzer

add ierr and return ierr; to many PetscFinalize() in examples
add ierr and if (ierr) return ierr; to some PetscInitialize() in examples

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Merge branch 'maint'

The deprecated -log_summary_exclude was still being used when it should have been -log_exclude

Reported-by: Jose E. Roman <jroman@dsic.upv.es>

Merge branch 'barry/fix-some-clang-warnings'

Fix most C examples to return ierr on failed PetscInitialize() or PetscFinalize()

Formatting fixes for many C examples including removing extra lines
Fixed a few set but not used variables detected

Fix most C examples to return ierr on failed PetscInitialize() or PetscFinalize()

Formatting fixes for many C examples including removing extra lines
Fixed a few set but not used variables detected by the clang static analyzer

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Merge branch 'maint'

Added ISLoad() for ISGENERAL ISs

Also included test example

Reported-by: Ed Bueler <elbueler@alaska.edu>

Fix a variety of set but not used examples in the tests

Mostly ierr
Detected by the clang static analyzer

Changed the C examples to return the error code in main()

Merge branch 'tisaac/sf-fix-multi-sf-leaves'

* tisaac/sf-fix-multi-sf-leaves:
PetscSFDistributeSection(): handle case when nrooots < end of chart
PetscSF: fix PetscSFGetMultiSF() for sparse leav

Merge branch 'tisaac/sf-fix-multi-sf-leaves'

* tisaac/sf-fix-multi-sf-leaves:
PetscSFDistributeSection(): handle case when nrooots < end of chart
PetscSF: fix PetscSFGetMultiSF() for sparse leaves
PetscSF: make regression test that fails

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some uses of PetscTryMethod() actually require that the

object is correct and the function returns an appropriate value.
Change those calls to PetscUseMethod().

Add needed petscao.h

(previously example including petsc.h which I removed but I did not realize that ao was needed)

Reported-by: nightly tests