petsc4py: add interface to KSPMatSolve()

petsc4py: tarball - do not builds docs

petsc4py: Reorganize source tree to follow the src package layout

Co-authored-by: Jose Roman <jroman@dsic.upv.es>

petsc4py: Merge libpetsc4py in petsc4py.PETSc

Fix Vec, SF, Section and IS manual pages

Commit-type: documentation

Have PETSc's website include petsc4py API doc

Put slightly more mention of petsc4py in website

TODO: improve website presentation and introduction to petsc4py

Commit-type: documentation
Thanks-to:

Have PETSc's website include petsc4py API doc

Put slightly more mention of petsc4py in website

TODO: improve website presentation and introduction to petsc4py

Commit-type: documentation
Thanks-to: Satish Balay

Development Tools: Vim, Emacs, Eclipse

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Merge branch 'stefanozampini/gc-again' into 'main'

GC fixes again

See merge request petsc/petsc!6096

Merge branch 'release'

Increase patchlevel to 3.18.5

Update a python example for adjoint ARKIMEX

Test the adjoint ARKIMEX in python

petsc4py: Add interface for PCDEFLATION

petsc4py: XXXReset can be called from XXXDestroy when garbage collecting during PETSc finalize

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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CI doesn't support except 0 nogil

use nogil except 0

fix when garbage collecting during python finalization

XXXDestroy_Python can be called when python is finalizing.
PyGILState_Ensure() will segv in that case
The fix is to follow mpi4py and segregate

fix when garbage collecting during python finalization

XXXDestroy_Python can be called when python is finalizing.
PyGILState_Ensure() will segv in that case
The fix is to follow mpi4py and segregate code that need to be run with GIL in another function

Thanks-to: dalcinl <dalcinl@gmail.com>

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Convert Petsc4Py to enum PetscErrorCode

Switch PetscErrorCode from int to enum in Cython

Make PetscErrorCode a non-discardable enum