PetscSFGetGraph: Remove comment with dead code and add note to docs

PetscSF: Various fixes and cleanups

* Add missing PetscSFGetType()
* PetscSFDestroy_XXX() now calls PetscSFReset_XXX(), otherwise changing
the SF type with PetscSFSetType() may leak memory.
* Fix

PetscSF: Various fixes and cleanups

* Add missing PetscSFGetType()
* PetscSFDestroy_XXX() now calls PetscSFReset_XXX(), otherwise changing
the SF type with PetscSFSetType() may leak memory.
* Fix init/computation of {min|max}leaf and use maxleaf where required
rather than recomputing the value in a loop
* Add logging event for PetscSFSetUp()
* Add tons of missing error checking
* Enable missing Fortran wrappers that can be generated automatically
* Support for command line options -{info|log}_exclude
* Various doc fixes
* Add tests for SFs with empty graphs

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ISView: Fix MPI_SUM -> MPI_MAX to determine maximum message to arrive

MPI I/O: Support for view/load ISGENERAL

Merge remote-tracking branch 'origin/knepley/fix-snes-ex69' into tisaac/feature-dmfield

* origin/knepley/fix-snes-ex69: (311 commits)
PetscFECreateDefault: fix custom Fortran interface to use MPI_

Merge remote-tracking branch 'origin/knepley/fix-snes-ex69' into tisaac/feature-dmfield

* origin/knepley/fix-snes-ex69: (311 commits)
PetscFECreateDefault: fix custom Fortran interface to use MPI_Comm
SNES ex69: Updated test output
SNES ex69: Removed all mantle stuff and change fields to constants - Also use dsymutil for executables
SNES ex69: Removed special partition
SNES ex69: Fixed null space creation - Null space locks its vectors
PetscFE: PetscFECreateDefault() now takes MPI_Comm instead of DM
cleanup very ugly PCGAMG manual page
minor clarifications for VecScatterCreate() manual page
gcov: PETSC_ARCH is required onlyfor -run_gcov - and not for -merge_gcov [where it doesn't exist]
make clearer in help statements what --with-external-packages-dir is for.
Website: Added news entry for PETSc User Meeting 2018 on main page.
CUDA: Further test output fixes for mat_tests-ex2
Turn off elemental test for parmetis running since this does not work on batch systems.
3.8 Changes: KSPCHEBYSHEV
CUDA: Fixed most test errors due to MatMultTranspose*
website: update urls
website: fix Jason's name to match pic. Also add Todd's pic
Dev manual: copyedit
DMPlexDistributeLabels: Propagate the output flag
cuda/cusp: update minimum supported versions of cuda to 7.5 and cusp to 0.5.0
...

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Merge branch 'haplav/fix-PetscSFView-no-graph-set' [PR #878]

* haplav/fix-PetscSFView-no-graph-set:
PetscSFView: call PetscSFSetUp only if graph is set.

PetscSFView: call PetscSFSetUp only if graph is set

Merge branch 'pr838/haplav/haplav/feature-petscpartitionermatpartitioning-rb/master'

* pr838/haplav/haplav/feature-petscpartitionermatpartitioning-rb/master:
Implemented wrapper of MatPartitioning i

Merge branch 'pr838/haplav/haplav/feature-petscpartitionermatpartitioning-rb/master'

* pr838/haplav/haplav/feature-petscpartitionermatpartitioning-rb/master:
Implemented wrapper of MatPartitioning into PetscPartitioner.

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ISSTRIDE: fix bug in ISView for MATLAB format

Fix issues reported by nightly builds

I really don't know why the testing bddc code was included in the commit

IS: added MATLAB format to ISView_{General|Stride|Block}

PetscSection: doc "seealso" fix

need custom Fortran stubs for these static inline functions

Commit-type: bug-fix
Reported-by: nightly tests

Small fix for documentation

Change Fortran SETERRA and SETERRQ to be simple statements

Also fix for --with-errorchecking=0 and repair shashi.F90 (which was
invalid for a variety of reasons) so that it compiles. Fortran is not

Change Fortran SETERRA and SETERRQ to be simple statements

Also fix for --with-errorchecking=0 and repair shashi.F90 (which was
invalid for a variety of reasons) so that it compiles. Fortran is not
my favorite language.

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PetscSection: add missing checks

These are still other arguments that needs to be checked. I got tired...

ISEqualUnsorted implemented

PetscSectionCreate fixed Notes heading in doc

PetscSectionCompare implemented

Merge branch 'barry/all-new-test-harness-branches'

Merge branch 'barry/our-development-tools-are-primative'

Merge branch 'jed/tests-cxx-linker' into barry/more-to-new-test-harness

test cannot use 64 bit indices because C++ templates don't work for it on all systems

Commit-type: portability-fix, testing-fix
Reported-by: nightly tests

Merge remote-tracking branch 'origin/barry/utilize-hwloc-rebased-v4'