Merge branch 'barry/clarify-dmplex-documentation' [PR #917]

* barry/clarify-dmplex-documentation:
Rename DM[GS]etDefault{Global}Section() to DM[GS]et{Global}Section().
Add DMPlexComputeGeometryFEM()

Merge branch 'Fande-Kong/Fixed_SNESTestJacobian_maint' [PR #1040]

* Fande-Kong/Fixed_SNESTestJacobian_maint:
Adds 3.9.x backwards compatibility for runtime options passed to SNESTestJacobian()

SNES: Backporting 3.9.x API, reintroducing threshold print.

Barry's fixes to SNESTestJacobian (accidentally?) removed the possibility
of only printing a threshold-version of the diff'd Jacobian matr

SNES: Backporting 3.9.x API, reintroducing threshold print.

Barry's fixes to SNESTestJacobian (accidentally?) removed the possibility
of only printing a threshold-version of the diff'd Jacobian matrices.
This commit adds this option back in, using the old -snes_test_jacobian_display_threshold.
For backwards compatibility, also -snes_test_jacobian_display is reintroduced.

Eventually, we want to unify the runtime options used here.
This needs to happen in a follow-up commit that does not get merged to the 3.9.x-version of 'maint'.

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Put in whitespace to match indentation of other messages

Commit-type: style-fix
Reported-by: Hong Zhang <hongzhang@anl.gov>

missing CHKERRQ() and typo

Commit-type: bug-fix, documentation
Reported-by: Hong Zhang <hongzhang@anl.gov>

Add support to SNESTestJacobian() for viewing the matrices with any standard viewer

Commit-type: feature

Refactor SNESTestJacobian() to display norms of differences first, display both Jacobian and Jacobian for preconditioner

Commit-type: feature

Merge branch 'master' into knepley/feature-pc-patch

* master: (226 commits)
fix bib
type in bibtex entry
copy edits to bibtex items
Hypre matrix: small fix
Hypre matrix: fixed compiler war

Merge branch 'master' into knepley/feature-pc-patch

* master: (226 commits)
fix bib
type in bibtex entry
copy edits to bibtex items
Hypre matrix: small fix
Hypre matrix: fixed compiler warnings
Plex: Fixed missing PetscRealPart() in partition balance.
Added MatZeroEntries_HYPRE
Removed outdated mention of cusp and thrust from installations instructions; remove cusp from example configurations
Remove another location where fshift was used with -1 to indicate handling of error condition which was never handled
Generate an immediate error, if requested, if CG detects indefinite PC or Mat
Remove hack of using special fshift value of -1 to indicate error handling, was broken for MatSOR_SeqAIJ and did nothing constructive in the other cases
Options: Fix sys_tests-ex6 to not print options
PetscOptionsDestroy: Add missing free() call
Configure: Pragmatic now requires Cxx11
Error check that the communicator in the IS matches that in the matrix otherwise ISAllGather() produces incorrect results.
Options: Code reorganization and faster option lookup
fix compile warning
Doc: Fixed manpage for PCFieldSplitSetSchurPre()
mpiuni: build somempifort.o after mpiuni.mod
Remove use of common block from MPIUNI code
...

Conflicts:
include/petscdm.h
include/petscpc.h
include/petscpctypes.h
src/dm/impls/plex/plexcreate.c
src/dm/impls/plex/plexdistribute.c
src/ksp/pc/impls/makefile
src/ksp/pc/interface/pcregis.c

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Options: Code reorganization and faster option lookup

* Speedup option lookup by using a auxiliary hash table.
* Move many routines around to make the implementation easier to follow.
Eventually,

Options: Code reorganization and faster option lookup

* Speedup option lookup by using a auxiliary hash table.
* Move many routines around to make the implementation easier to follow.
Eventually, we may split options.c in two, all of the query routines
PetscOptionsGetXXX() do not need (and should not have) access to the
PetscOptions data structure.
* Restore proper handling of monitors in set/clear option events.
* Add PetscOptionsHasHelp(), eventually we may add a "category" argument
to do special handling of let say `-help <package>`
* Change PetscOptionsReject() to handle option prefix, this makes the call
easier to use in XXXSetFromOptions() implementations.

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Merge branch 'barry/allow-snes-unlimited-function-evaluations'

Merge remote-tracking branch 'origin/maint'

Allow -1 to SNESSetTolerances() and -snes_max_funcs to indicate unlimited number of function evaluations

This is useful when running with -snes_test_jacobian and other use cases

Commit-type: featur

Allow -1 to SNESSetTolerances() and -snes_max_funcs to indicate unlimited number of function evaluations

This is useful when running with -snes_test_jacobian and other use cases

Commit-type: feature
Reported-by: Hong Zhang <hongzhang@anl.gov>

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SNES: Fix 'extern' declarations

Merge branch 'master' into knepley/feature-pc-patch

* master: (107 commits)
cast in GAMG_HASH so that it works for PetscInt32 near PETSC_INT_MAX without overflow to negative numbers
Add link for

Merge branch 'master' into knepley/feature-pc-patch

* master: (107 commits)
cast in GAMG_HASH so that it works for PetscInt32 near PETSC_INT_MAX without overflow to negative numbers
Add link for DrMemory which may serve as an alternative to valgrind on Windows
Finish Gail's copyedits for developers manual.
openmpi: fix namespace conflict [with static build on ppc64le]
two pages of Gail's edits to developers guide
Another chapter of Gail's copyedits for the developers guide
Gail's copyedits on two more chapters of the developers guide
Fix more %d to %D in GAMG code. Fix code style in GAMG code
DMPlexVTK: vertices is int! need to use %d instead of %D
TS ex18: update outputs (reported by nightly tests)
Use %D in error messages for GAMG hash; fix style issues with GAMG hash
config: Update petsc4py git commit
Fix bad plain extern declaration.
Add Gail's copyedits for the initial portion of the developers guide
Add missing common block to subroutine
fix mpiuni tests with xl compilers
Copy & paste the change on PetscSparseDensePlusDot
Fix a wrong macro
PetscInfo: Add missing errorchecking
Log: various fixes and cleanups
...

Conflicts:
src/dm/impls/plex/plex.c

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Restore Push/Pop model for ASCII viewers

Log: various fixes and cleanups

- Reorganize declarations in petsclog.h
- Better -log_exclude, now applies to all registered stages
- Minor fixes to implementation of -info_exclude
- PCASM: Log appl

Log: various fixes and cleanups

- Reorganize declarations in petsclog.h
- Better -log_exclude, now applies to all registered stages
- Minor fixes to implementation of -info_exclude
- PCASM: Log apply-on-blocks KSP solves
- Rename PetscLogDestroy() -> PetscLogFinalize() and hide it from the API

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Merge branch 'master' into knepley/feature-pc-patch

* master: (562 commits)
fix clang-analyzer warning
Developers manual never use system randomizers in PETSc and example source code.
missing

Merge branch 'master' into knepley/feature-pc-patch

* master: (562 commits)
fix clang-analyzer warning
Developers manual never use system randomizers in PETSc and example source code.
missing CHKERRQ()
DT: Reverting the tgamma change broke MPFR - I guess we need a nightly build with it in
Add a test for ex21
Fix error in ex21
Add missing fortran interface that handles null objects
DMComposite: add missing guards
MatPreallocate: fix overpreallocation of local rows
style fixes
MatView_MPI_DA: do not print twice the class prefix
MatSetOperation: stash the original MatView_XXX in the viewnative function pointer
DMCreateInterpolation_DA gracefully error instead of catching FPE signals
MatIncreaseOverlap: preserve communicator of index sets
MatMPIAIJ: fix indentation and missing CHKERRQ
ISBuildTwoSided: remove tabs and fix style
Fix documentation
PetscViewerDraw: fix unininitialized warning from valgrind
MatConvert_SeqAIJ_SeqBAIJ: remove error for non square matrices and add MAT_REUSE_MATRIX case
Mat: MAT_INPLACE_MATRIX can be used for transposition with rectangular matrices
...

Conflicts:
src/dm/dt/interface/dtfe.c
src/dm/impls/plex/plex.c
src/dm/impls/plex/plexfem.c
src/snes/examples/tutorials/ex13.c
src/snes/examples/tutorials/ex62.c
src/snes/examples/tutorials/makefile
src/snes/examples/tutorials/output/ex62_18.out
src/snes/examples/tutorials/output/ex62_19.out
src/snes/examples/tutorials/output/ex62_20.out
src/snes/examples/tutorials/output/ex62_20_parmetis.out
src/snes/examples/tutorials/output/ex62_21.out
src/snes/examples/tutorials/output/ex62_22.out
src/snes/examples/tutorials/output/ex62_23.out
src/snes/examples/tutorials/output/ex62_24.out
src/snes/examples/tutorials/output/ex62_25.out
src/snes/examples/tutorials/output/ex62_26.out
src/snes/examples/tutorials/output/ex62_27.out
src/snes/examples/tutorials/output/ex62_28.out
src/snes/examples/tutorials/output/ex62_29.out
src/snes/examples/tutorials/output/ex62_2d_p3_1.out
src/snes/examples/tutorials/output/ex62_30.out
src/snes/examples/tutorials/output/ex62_31.out
src/snes/examples/tutorials/output/ex62_32.out
src/snes/examples/tutorials/output/ex62_33.out
src/snes/examples/tutorials/output/ex62_34.out
src/snes/examples/tutorials/output/ex62_35.out
src/snes/examples/tutorials/output/ex62_36.out
src/snes/examples/tutorials/output/ex62_pc_simple.out
src/snes/examples/tutorials/output/ex62_pc_simplec.out
src/snes/examples/tutorials/output/ex62_quad_q2p1_full.out
src/snes/examples/tutorials/output/ex62_quad_q2q1_full.out
src/snes/utils/dmplexsnes.c

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Merge branch 'maint'

Merge branch 'maint'

Fixes for annoying warnings from GNU (-Wmaybe-uninitialized)

clarify SNESGetFunction()

Commit-type: documentation

Merge branch 'maint'

Allow Fortran versions of SNESSetJacobian(), TSSetRHSJacobian() and TSSetIJacobian() to take PETSC_NULL_MAT as the matrix arguments

Commit-type: fortran-feature
Reported-by: Praveen C <cpraveen@gmai

Allow Fortran versions of SNESSetJacobian(), TSSetRHSJacobian() and TSSetIJacobian() to take PETSC_NULL_MAT as the matrix arguments

Commit-type: fortran-feature
Reported-by: Praveen C <cpraveen@gmail.com>

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