Add to CI compilers flags '-Wconversion', '-Wno-sign-conversion', '-Wno-float-conversion', '-Wno-implicit-float-conversion']

Also fix the code to repository to compile cleanly with these flags in th

Add to CI compilers flags '-Wconversion', '-Wno-sign-conversion', '-Wno-float-conversion', '-Wno-implicit-float-conversion']

Also fix the code to repository to compile cleanly with these flags in the CI

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PC: add new mat ops MATOP_GET_{BLOCK, VBLOCK}_DIAGONAL

so that a shell matrix can return its own (variable) point blocks in a matrix for use in PC (V)PBJacobi

MatSetPreallocationCOO_MPIAIJ: minor tweaks

do not create a name if not present
set maxnz to nz for proper display of allocated nonzeros

Merge branch 'release-revert-7765'

Fix a bug that the old MatMPIAIJSetPreallocation_MPIAIJKokkos did not set blocksize of A/B from mat

checkbadSource: add check for PetscSafePointerPlusOffset

Merge branch 'jose/deprecate-petsc-default' into 'main'

Fix usage of deprecated PETSC_DEFAULT

See merge request petsc/petsc!7707

Fix usage of deprecated PETSC_DEFAULT

Add shared memory support for PCMPI using both shmget() and MPI_Win_allocate_shared()

Merge branch 'barry/2024-06-30/doc-vecsetinf' into 'main'

Refactor VecSetInf() into VecFlag() and deprecate VecSetInf()

See merge request petsc/petsc!7661

Refactor VecSetInf() into VecFlag() and deprecate VecSetInf()

Reported-by: Stefano Zampini

Merge remote-tracking branch 'origin/release'

MATMUMPS: do not report error if size is 0

MUMPS does not support 0 sized problems, these errors are benign for PETSc since the solver will never be run

Merge remote-tracking branch 'origin/release'

Docs: fix typos and extra characters

Kokkos: try to always have an execution space argument

Config: get rid of PETSC_HAVE_MPICH_NUMVERSION and use petscpkg_version.h

Mat: fix -Wmissing-field-initializers

This requires some changes to user FORTRAN code

Pass PETSC_NULL_XXX_ARRAY when passing a NULL as an argument that is expecting an array
Pass PETSC_NULL_ENUM when argument returns an enum instead of

This requires some changes to user FORTRAN code

Pass PETSC_NULL_XXX_ARRAY when passing a NULL as an argument that is expecting an array
Pass PETSC_NULL_ENUM when argument returns an enum instead of PETSC_NULL_INTEGER
Pass arrays (and not scalar values) when the argument is expecting an array; this means replace, for example, the argument v with [v]
Use PetscObjectIsNull(obj) to check if the object is NULL, instead of obj == PETSC_NULL_XXX

The compiler will now automatically prevent you from using the wrong argument type for the first three bullets above
This will also require an update sowing with the new sowing branch this MR is using.

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Merge remote-tracking branch 'origin/release'

Minor docs fixes

Mat: reuse the Mvctx by reference count in MatDuplicate_MPIAIJ

Merge remote-tracking branch 'origin/release'