Merge remote-tracking branch 'origin/dalcinl/fix-null'

TS/SNES/Tao: Fix 0 ->NULL for pointers

See merge request petsc/petsc!2783

SNES: Replace 0 -> NULL for pointers

Merge remote-tracking branch 'origin/maint'

Merge branch 'jed/sneslinesearch-type/maint' into 'maint'

Jed/sneslinesearch type/maint

See merge request petsc/petsc!2692

SNES: only change linesearch type when not already set

This is necessary to allow users to SNESLineSearchSetType before SNESSetFromOptions.

Merge branch 'wence/feature/patch-dense-inverse' into 'master'

patch dense inverse

See merge request petsc/petsc!2000

SNESPATCH: set vec layout appropriately

Patch: Use work vectors for patch solves

Rather than making vectors for each patch, just make one big enough
for the largest patch and reuse. Significantly increases performance
for small patch size

Patch: Use work vectors for patch solves

Rather than making vectors for each patch, just make one big enough
for the largest patch and reuse. Significantly increases performance
for small patch sizes.

In addition, remove log events from inner loop (which also costs a not
insignificant amount of time).

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Merge branch 'knepley/is-separate-section' into 'master'

Knepley/is separate section

See merge request petsc/petsc!2065

Knepley/is separate section

Merge branch 'master' into this one.

Merge branch 'barry/2019-09-01/rm-default-language-from-dm' into 'master'

Update public API, and internal naming conventions for DM to eliminate use of...

See merge request petsc/petsc!1998

Update public API, and internal naming conventions for DM to eliminate use of "default" (previously refered to default sections)

Commit-type: style-fix, documentation

Merge remote-tracking branch 'origin/psanan/docs-remove-manconcepts' [PR #1733]

Man pages: remove Concepts: fields

These fields were previously stripped from the man pages by logic removed in
21a59cba2737d49dc2f0bd12c08db0d2a3f3f209

Remove these fields from all man pages (but

Man pages: remove Concepts: fields

These fields were previously stripped from the man pages by logic removed in
21a59cba2737d49dc2f0bd12c08db0d2a3f3f209

Remove these fields from all man pages (but not from examples).

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 -not -path "*/examples/*" -not -name "*.html" -not -name "*.bib" -exec gsed -i '/Concepts:/ {N; /\n\s*$/d}' {} +
find src -type f -not -path "*/examples/*" -not -name "*.html" -not -name "*.bib" -exec gsed -i '/Concepts:/d' {} +
find include -type f -not -path "*/examples/*" -not -name "*.html" -not -name "*.bib" -exec gsed -i '/Concepts:/ {N; /\n\s*$/d}' {} +
find include -type f -not -path "*/examples/*" -not -name "*.html" -not -name "*.bib" -exec gsed -i '/Concepts:/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 barry/fix-linesearch-usage (pull request #1563)

SNESLineSearch should only be created and used if the SNES type requires the line search

SNESLineSearch should only be created and used if the SNES type requires the line search

Previously the line search was created for all solver and and SNESLineSearchSetFromOptions()
and SNESLineSear

SNESLineSearch should only be created and used if the SNES type requires the line search

Previously the line search was created for all solver and and SNESLineSearchSetFromOptions()
and SNESLineSearchView() called for all solvers, even those that never used it,
leading to confusion for users

Commit-type: feature, documentation
Reported-by: Robert Nourgaliev <nourgaliev1@llnl.gov>

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fix missing CHKERRQ

Merge branch 'master' into wence/feature-patch-all-at-once

Merge branch 'knepley/feature-snes-patch' [PR #1332]

* knepley/feature-snes-patch:
Implement SNESPATCH, a SNES for the topological construction of nonlinear relaxation methods.

Fix some review comments

More C89 build fixes

When solving a nonlinear problem, we need _all_ the information
about the state on the patch, including the values of dofs that
feature in global (as well as artificial) boundary conditions.
So we mu

When solving a nonlinear problem, we need _all_ the information
about the state on the patch, including the values of dofs that
feature in global (as well as artificial) boundary conditions.
So we must build this function space on each patch, too, and
the scatters from the smallest patch to this one.

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Store a Boolean for whether we're PCPATCH or SNESPATCH

SNESPATCH: Do the same thing for the residual evaluation