update documentation and options database of MatProductSetAlgorithm()

Merge remote-tracking branch 'origin/release'

Merge branch 'barry/2022-02-09/refresh-website/release' into 'release'

Minor refesh of some of the website introductory material and front page

See merge request petsc/petsc!4830

Minor refesh of some of the website introductory material and front page

Commit-type: docs-only
/spend 20m

Mat: add a new MatOrderingType - MATORDERINGMETISND

Metadocs: provide fallback text for links from the manual to pages outside manual

Docs: fix link syntax in manual

Docs: add alt text for link to section outside of manual PDF

Docs: only show hint to open local HTML docs for "html" builder, not "dirhtml"

Using "dirhtml" locally requires one to run a local web server
(or click through extra links from directory indexes).

Enable DMGetFirstLabeledPoint() in public API

Delete a duplicated line dev.rst

Merge branch 'jczhang/change-VecGetArrayAndMemType-semantics' into 'main'

Let VecGetArrayAndMemType always return device pointer when possible

See merge request petsc/petsc!4308

Vec: add Vec{Get,Restore}ArrayWriteAndMemType()

Merge branch 'jed/mat-coo-size_t' into 'main'

MatSetPreallocationCOO: use PetscCount for length argument

See merge request petsc/petsc!4789

MatSetPreallocationCOO: use PetscCount for length argument

This is necessary to support assembly even when the vector size and
number of nonzeros is well below 2B. For example, with a scalar problem

MatSetPreallocationCOO: use PetscCount for length argument

This is necessary to support assembly even when the vector size and
number of nonzeros is well below 2B. For example, with a scalar problem
on Q_1 hexes, you have 8*8=64 entries per element and thus hit 2B around
33M elements. This change allows such problems to be solved without
promoting to 64-bit indices everywhere (a storage and bandwidth cost).

PetscCount is a new signed type equivalent to ptrdiff_t, meant for array
indices and sizes that may overflow int32_t even when solving a problem
whose dimension fits in int32_t.

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Merge branch 'adams/pchypre_use_tpl_spgemm' into 'main'

Add API for hypre flag to use third party SpGEMM

See merge request petsc/petsc!4781

Add API for hypre flag to use third party SpGEMM

doc: fix bad merge 25473075d0bc9d6750db369b1966d43fdc421b8a

Merge remote-tracking branch 'origin/release'

Update doc/petsc.bib

PetscSizeT: make type available in C for consistency with Fortran

MatStructures: no space in enumeration

Merge branch 'jwallwork23/uniform-opt' into 'main'

Metric optimizations: isotropic and uniform cases

See merge request petsc/petsc!4795

plex metric: isotropic and uniform optimizations

Update doc/petsc.bib