Merge branch 'jolivet/feature-kspmatsolve-deprecate-ksphpddmmatsolve' into 'master'

Change how solves with multiple RHS work

See merge request petsc/petsc!2811

Change how solves with multiple RHS work

* Deprecate KSPHPDDMMatSolve
* Add KSPMatSolve, previously known as KSPHPDDMMatSolve
* New option -ksp_matsolve_block_size
* New routines MatDense[Get|Restor

Change how solves with multiple RHS work

* Deprecate KSPHPDDMMatSolve
* Add KSPMatSolve, previously known as KSPHPDDMMatSolve
* New option -ksp_matsolve_block_size
* New routines MatDense[Get|Restore]SubMatrix

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Merge branch 'stefanozampini/feature-add-hpackages-rebased' into 'master'

Fixes to MatProduct + many bug fixes + new hierarchical matrix support

See merge request petsc/petsc!2800

MATHARA: matrix class for hierarchical matrices

supports CPU and GPU matrices
distributed support limited to matrix generation and matmult (no transpose)

MATSHELL: add support for MatMat operations

Added MatIsShell to inquire about the presence of the shell specific data

MatProduct: proper cleanup of additional data structure

Do not mess with view/destroy routine, add an extra slot to MatProduct struct to stash the data, destroy/view routines
Deprecate MatFreeInterm

MatProduct: proper cleanup of additional data structure

Do not mess with view/destroy routine, add an extra slot to MatProduct struct to stash the data, destroy/view routines
Deprecate MatFreeIntermediateStructures in favor of MatProductClear
Clean up base headers for matrix classes
Update tests (remove some todos from ex70 because now the tests work properly)
MatProductSetType should not set the setfromoptions operation!
MatProductClear should reset operations
Remove no longer needed function composition
Add few more PetscInfo messages
Single dispatch routine
MatProductSetFromOptions routines are now allowed to fail
MatProductSetFromOptions_SeqXBAIJ_SeqDense: support for MATPRODUCT_AtB
MatTransposeMatMultNumeric_SeqAIJ_SeqDense: fix bug with leading dimensions
Make internal functions PETSC_INTERN
Fix a couple of places where the destroy routine of the matrix was changed
Products should all use internal data (or composed data attached to the internal data)
Fix few bugs in MPIAIJ_MPIDENSE product with stages

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MATDENSE: Add MatDenseSetLDA

clean up seqdense data from max and changelda entries

MATDENSE: add MatDenseReplaceArray() and MatDenseCUDAReplaceArray()

Add few interface checks

MatProduct: add support for basic AB and AtB products with B of type dense

do not fail if not supported
MatProductSetAlgorithm should copy the string, not the pointer!
Fix various checks
Fix new mat

MatProduct: add support for basic AB and AtB products with B of type dense

do not fail if not supported
MatProductSetAlgorithm should copy the string, not the pointer!
Fix various checks
Fix new mat/vec type propagation in few cases

Reported-by: "Jose E. Roman" <jroman@dsic.upv.es>, Pierre Jolivet <pierre.jolivet@enseeiht.fr>

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MATDENSE: add API to access columns as vectors

MATMPIDENSE: support CUDA

MatSeqDense: add support to check for symmetricity

Add array accessors routines

fix MatSetRandom for leading dimension

Use PetscSF for MatMult
- uses the right communica

MATMPIDENSE: support CUDA

MatSeqDense: add support to check for symmetricity

Add array accessors routines

fix MatSetRandom for leading dimension

Use PetscSF for MatMult
- uses the right communication pattern instead of point-to-point
- can take advantage of CUDA aware MPI

Fix bugs related with LDA
Fix direct usage of cpu memory: use MatDenseGetArray (and variants) instead
Fix MatZeroRows
Fix MatView in Binary for SeqDense

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MatMultEqual and friends: use single drivers

Mat: add setter/getter for default vec type

Merge remote-tracking branch 'origin/maint'

Merge branch 'jolivet/fix-mathasoperation-docs' into 'maint'

Remove deprecated MatOperation

See merge request petsc/petsc!2786

Remove deprecated MatOperation

Merge remote-tracking branch 'origin/maint'

Merge branch 'jolivet/fix-hpddm-missing-interface' into 'maint'

Add KSPHPDDMMatSolve()

See merge request petsc/petsc!2730

Minor fixes and improvements

* Typos
* MatMatSolve() improvements
* MatDense[Get|Restore]ColumnF90()
* MatKAIJGetScaledIdentity()

Merge branch 'hzhang/fix-MatProductSetFromOptions-err' into maint

Ref: https://gitlab.com/petsc/petsc/-/merge_requests/2723

Merge branch 'hzhang/fix-MatProductSetFromOptions-err' into 'master'

fix error report in MatProductSetFromOptions_xxx

See merge request petsc/petsc!2723

Add the product type and matrix types for the error report in MatProductSetFromOptions_matA_matB_matC()
Requested by Jed Brown

Merge remote-tracking branch 'origin/maint'

Merge branch 'hzhang/fix-matmatapi' into 'maint'

Add MatProductClear(); fix matmatapi

See merge request petsc/petsc!2665

fix dangling pointer; add MatProductClear() as suggested by Lisandro