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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Plex: Fix for complex

Plex: Fixed bug in drawing distorted quads

Plex: Added DMPlexRemapGeometry()
- DMPlexShearGeometry() is a special case

doc fixes

DMPlexOrientInterface: Fix the bug in condition for non-conformance.

This would falsely take two points on different ranks with the same local index as same point and rarely prevent reorientation.

Merge branch 'jacobf/feature-modified-gram-schmidt-orthogonalization' into 'master'

Feature: modified gram schmidt orthogonalization

See merge request petsc/petsc!2086

Rename PETSC_HAVE_MPI_WIN_CREATE_FEATURE to PETSC_HAVE_MPI_PROCESS_SHARED_MEMORY

To have clear distinction from PETSC_HAVE_MPI_WIN_CREATE

now just normalizing everyone in one loop

fixed renormalization of already normalized translation modes

dm_impls_plex_tutorials-ex1%: Improve overlap testing.

* consolidate dm_impls_plex_tutorials-ex1_refine_overlap% tests
* allow overlap > 1
* call DMPlexGetOverlap() and view result

DMPlexInterpolatePointSF: throw error for overlapped DMPlex

DMPlexCheckPointSF: warning and skip for overlapped DMPlex

DMPlexDistributeOverlap: check overlap is the same on all ranks

DMPlexCreateOverlapLabel: return NULL for size=1

DMPLex: Store overlap, add DMPlexGetOverlap().

Add new overlap to the old one.

DMPlexCreateOverlap -> DMPlexCreateOverlapLabel; doc fixes

fixed dim optimizations but dmplexgetrigidbodies would fail if i=dim

vecmdot fix

Modified gram schmidt method for dmplexcreaterigidbodies

working implementation of modified GS method, tested with ex3 noncomforming_tensor_2/3

working implementation of modified GS method, tested with ex3 noncomforming_tensor_2/3

Merge remote-tracking branch 'origin/valeria/improve-DMPlexCreateSphereMesh-doc'

See merge request petsc/petsc!2087

Merge branch 'master' into 'master'

Add --download-hpddm

See merge request petsc/petsc!1994

Testing PCHPDDM and KSPHPDDM