Plex: Use new API to handle hybrid and FV ghost cells

Improve DM label list. Generalize DMCopyLabels().

* DMAddLabel:
- Add label to the end of list so DMGetLabelByNum() keeps the numbering of old ones.
- Assign depth label right away.
* Get rid of

Improve DM label list. Generalize DMCopyLabels().

* DMAddLabel:
- Add label to the end of list so DMGetLabelByNum() keeps the numbering of old ones.
- Assign depth label right away.
* Get rid of DMLabelLinkList.
* Make use of PetscObject reference count of individual labels.
* DMCopyLabels: add input args PetscCopyMode mode and PetscBool all.
* Update PetscCopyMode manpage for use with objects.

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PetscFE: Added PetscFECopyQuadrature()
- Replace Get/SetQuqadrature pattern with this function
- Corrected error in SNES ex24 due to wrong face quadrature

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

Commit-type: style-fix, documentation

DMGetSection: replace all internal usage with DMGetLocalSection

Same for DMSetSection -> DMSetLocalSection. We retain the interface
for DMGetSection/DMSetSection without deprecation warnings (for n

DMGetSection: replace all internal usage with DMGetLocalSection

Same for DMSetSection -> DMSetLocalSection. We retain the interface
for DMGetSection/DMSetSection without deprecation warnings (for now).

Suggested-by: Barry Smith <bsmith@mcs.anl.gov>

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DMGetDefaultSection et al: add PETSC_DEPRECATED_FUNCTION

These functions were deprecated in v3.9, but no
PETSC_DEPRECATED_FUNCTION was added at that time so many uses crept
back into the source code

DMGetDefaultSection et al: add PETSC_DEPRECATED_FUNCTION

These functions were deprecated in v3.9, but no
PETSC_DEPRECATED_FUNCTION was added at that time so many uses crept
back into the source code. Here we mark it deprecated and fix all
existing uses in PETSc.

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swarm.c edited online with Bitbucket
Reported-by: Andrea Gallegati <andreagalle@hotmail.it>

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

DM interface

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

Merge branch 'maint'

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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Remove of variables that begin with _ since they are reserved for the system; in this case used by MinGW header.

Commit-type: portability-fix
Reported-by: Pierre Jolivet <pierre.jolivet@enseeiht.fr>

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

Merged in barry/rm-cmake-legacy (pull request #1714)

Remove legacy and cmake compile systems

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

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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