Merge branch 'jolivet/remove-cast' into 'main'

Use NULL or nullptr instead of casted 0

See merge request petsc/petsc!7857

Use NULL or nullptr instead of casted 0

Merge branch 'barry/2022-09-12/fix-mat-preallocation' into 'main'

try to build efficient hash table allocation directly into Mat

See merge request petsc/petsc!5621

Add support for Mat to allow skipping preallocation by having the first round of MatSetValues use hash

* MATPREALLOCATOR can be deprecated as well as possibly some other preallocation macros/routine

Add support for Mat to allow skipping preallocation by having the first round of MatSetValues use hash

* MATPREALLOCATOR can be deprecated as well as possibly some other preallocation macros/routines
* Optimizations such as direct support for MatSetValuesBlocked() for *BAIJ can be added in the future

Commit-type: feature
/spend 25h

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