Merge branch 'dalcinl/fix-null' into 'master'

Fix 0 -> NULL for pointers

See merge request petsc/petsc!3086

DM: Replace 0 -> NULL for pointers

Merge remote-tracking branch 'origin/maint'

Merge branch 'psanan/doc-dmda-dmstag-manpage-crosslinks' into 'maint'

Docs: man pages: add more DMDA-DMStag crosslinks

See merge request petsc/petsc!2136

Docs: man pages: add more DMDA-DMStag crosslinks

Merge branch 'dalcinl/fix-headers' [PR #1897]

* dalcinl/fix-headers:
Minor fixes to headers.

Fix a bunch of PetscValidPointer() -> PetscValidXXXPointer()

Merge branch 'barry/feature-boundedint'

Merged in dalcinl/dm-api (pull request #1850)

DM interface

Approved-by: BarryFSmith <bsmith@mcs.anl.gov>

DM: Deprecate DMCreateAggregates()

* This interface is untested and may be redundant
* DMDA is the only provider, keep it as DMDACreateAggregates()

DM: Simplify implementation of DMHasCreateInjection()

* Add log event for DMCreateInjection()
* Get rid of DMHasCreateInjection_Default()
* Rename dm->ops->getinjection to dm->ops->createinjection
*

DM: Simplify implementation of DMHasCreateInjection()

* Add log event for DMCreateInjection()
* Get rid of DMHasCreateInjection_Default()
* Rename dm->ops->getinjection to dm->ops->createinjection
* Improve error checking here and there

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Added PetscOptionsBoundInt(), error if value below bound, and PetscOptionsRangeInt(), error if out of range

Replaced a small amount of the usage in the source code. Easy, slightly boring process to

Added PetscOptionsBoundInt(), error if value below bound, and PetscOptionsRangeInt(), error if out of range

Replaced a small amount of the usage in the source code. Easy, slightly boring process to replace the rest

Commit-type: error checking

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Merged in barry/rm-section-da (pull request #1807)

Remove Section code from DMDA

Remove Section code from DMDA

Commit-type: cleanup

Merge remote-tracking branch 'origin/barry/add-petscarrayxxx-ops' [PR #1771]

Add PetscArraycmp(), PetscArraycpy(), PetscArrayzero(), PetscArraymove(), update code to use new forms

Replace a couple multi-mallocs with a single malloc
Replace backwards loops in MatSetValues_*()

Add PetscArraycmp(), PetscArraycpy(), PetscArrayzero(), PetscArraymove(), update code to use new forms

Replace a couple multi-mallocs with a single malloc
Replace backwards loops in MatSetValues_*() with PetscArraymove()

Commit-type: style-fix, feature

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Merged in psanan/man-pages-remove-keywords (pull request #1717)

Man pages: Remove .keywords fields

Approved-by: BarryFSmith <bsmith@mcs.anl.gov>

Man pages: remove .keywords: fields

This field is recognized by doctext from Sowing (http://wgropp.cs.illinois.edu/projects/software/sowing/doctext/node20.htm#Node20),
but it doesn't seem to be unif

Man pages: remove .keywords: fields

This field is recognized by doctext from Sowing (http://wgropp.cs.illinois.edu/projects/software/sowing/doctext/node20.htm#Node20),
but it doesn't seem to be uniformly used or maintained.

Thus, remove all .keywords: fields, and a following blank line, if present.

This is accomplished with GNU sed (gsed on OS X), with the following commands.
*Warning* that this type of command can corrupt a .git directory,
so be cautious in reusing or modifying these commands. They first look
for and delete matching lines with a following line consisting of only whitespace,
and then delete any remaining matching lines.

find src/ -type f -exec gsed -i '/keywords:/ {N; /\n\s*$/d}' {} +
find src/ -type f -exec gsed -i '/keywords:/d' {} +
find include/ -type f -exec gsed -i '/keywords:/ {N; /\n\s*$/d}' {} +
find include/ -type f -exec gsed -i '/keywords:/d' {} +

Hints on the sed command obtained from: https://unix.stackexchange.com/questions/100754/how-to-delete-a-specific-line-and-the-following-blank-line-using-gnu-sed

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Merged in psanan/dacreatec-edited-online-with-bitbucket-1557923426211 (pull request #1670)

DMDACreate man page fixes

Approved-by: Satish Balay <balay@mcs.anl.gov>

DMDACreate man page fixes

* change non-existent DMDADuplicate() link to DMClone()
* add missing newline
* update collectivity note

Merged in knepley/feature-expose-section-subdm (pull request #1455)

DM: Expose creation functions for subdm and superdm from a Section

Approved-by: BarryFSmith <bsmith@mcs.anl.gov>

DM: Expose creation functions for subdm and superdm from a Section

Merge from master

Merged petsc/petsc into master

Merge branch 'master' into knepley/fix-superdm-is

* master: (455 commits)
bib: spell out some names for format consistency with related refs
bib: two 2018 pubs now appeared
cleaning up analyze

Merge branch 'master' into knepley/fix-superdm-is

* master: (455 commits)
bib: spell out some names for format consistency with related refs
bib: two 2018 pubs now appeared
cleaning up analyzer warnings
compile fixes (workarround PGI bug?):
undoing the branch's changes to leastsquares outputs
more fixes for complex builds
compile error fix for complex builds
1) Look for 64 bit integer MKL BLAS if 64 bit indices are used with PETSc 2) Fix Pardiso code to only compile pardiso_init64 when needed, otherwise can generate warnings/errors
jenkins: run 'cleantest' before 'allgtest-tap' - an attempt to fix errors of type:
cuda: protect cuda includes
fix cuda warnings.
fix complex compile error
Revert "Improved polymorphism of interfaces for MatSetValuesBlocked()"
Bib: Updated ref
Doc: More function documentation
petscvec: move PetscSFCreateFromZero from vscat to vec sources
Fixed an uninitialized variable and got rid of an unused one.
memleak fixed and output files updated
fixing build errors on some archs
Mat: obey options prefix of Mat in MatNullSpaceTest
...

Conflicts:
include/petsc/private/dmpleximpl.h
src/dm/interface/dmi.c

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