Plex: Interior ghost must be distributed as cells

Added feature PetscSpace_Sum

Merge remote-tracking branch 'origin/maint'

Single petscdir.mk

Merge remote-tracking branch 'origin/maint'

DMPlexCreateBasisRotation: mention in relevant places

Merge remote-tracking branch 'origin/maint'

Plex: Better debugging print

PetscUnlikelyDebug: add useful macro for conditionals that should be skipped in optimized mode

PetscDefined: remove many uses of #ifdef PETSC_USE_DEBUG

Merge remote-tracking branch 'origin/maint'

Merge branch 'jose/maint/warnings-nolog' into 'maint'

Fix compile warning --with-log=0

See merge request petsc/petsc!2724

Merge branch 'jolivet/fix-neighbors-plex-overlap-0' into 'maint'

Fix DMGetNeighbors_DMPlex when overlap == 0

See merge request petsc/petsc!2715

Fix DMGetNeighbors_DMPlex when overlap == 0

Fix compile warning --with-log=0

Merge branch 'maint'

Plex+Doc fix

Typos

Merge remote-tracking branch 'origin/maint'

DMPlexGetDepth manpage: Empty mesh gives -1.

+ a few .seealso edits

Merge branch 'knepley/feature-dm-addboundary-collective' into 'master'

Knepley/feature dm addboundary collective

See merge request petsc/petsc!2659

Plex: Now subpointIS is managed by the DM

DM: Label completion moved from DMCreateLocalSection() to DMAddBoundary() - Labels must be complete to support BC for higher order spaces - DMAddBoundary() is now collective - PetscDSAddBoundary() is

DM: Label completion moved from DMCreateLocalSection() to DMAddBoundary() - Labels must be complete to support BC for higher order spaces - DMAddBoundary() is now collective - PetscDSAddBoundary() is also collective
- Labels are also completed in DMCopyDS()

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Merge remote-tracking branch 'origin/maint'

Merge branch 'dalcinl/fix-dmplex-invcell/maint' into 'maint'

DMPlex: Fix DMPlexInvertCell_Internal()

See merge request petsc/petsc!2676