Plex: Now for projection allow 3 DMs: input, output, and auxiliary
- We get the input DM from the input Vec
- Now we can have more general relations between input/output/auxiliary meshes in projectio

Plex: Now for projection allow 3 DMs: input, output, and auxiliary
- We get the input DM from the input Vec
- Now we can have more general relations between input/output/auxiliary meshes in projection and integration
- Added DMEnclosureType
- Added DMGetEnclosureRelation() and DMGetEnclosurePoint()
- Removed DMPlexGetSubpoint() and DMPlexGetAuxiliaryPoint()
- In projection, convert output mesh points to input mesh points
- Coordinates must be reordered after depth label is constructed
- DMPlexLabelAddFaceCells() only adds cells adjacent to faces
- Put in extra debugging for missing point enclosures
- In boundary projection, calculate face data for geometry
- p4est: use known point maps instead of projection to interp from base to coarse

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pforest.c: Note about leaves from p4est being sorted

Thanks-to: @tisaac

Plex: When constructing ghost cells, must preserve the hybrid cell information

- Need to distribute ghost cell info along with hybrid info

- Change the output format for ghost cells - Update TS ex18

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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--download-hpddm for PCHPDDM and KSPHPDDM

Merge branch 'haplav/feature-check-boundary-connected-prereq-leftovers' into 'master'

Minor improvements to DMPlex.

See merge request petsc/petsc!2062

Merge branch 'maint'

MSMPI-32: compile fixes

Reported-by: Mohammad Asghar <mohammad.asghar@lusas.com>

DMDestroyLabelLinkList: Rename to DMDestroyLabelLinkList_Internal.

* employ it in DMDestroy() to eliminate redundant code
* make it PETSC_INTERN

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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