ci: fixes for vermin python syntax checker

vermin -vv --backport argparse -t=2.6- -t=3.4- config

petsc4py: update to release 3.13.0

Back to SLEPc master branch

Merge branch 'balay/update-blis-for-osx/maint' into 'maint'

blis: update to 0.6.1+ snapshot with fix for OSX build [and and OSX test]

See merge request petsc/petsc!2669

slepc: update to v3.13

blis: update to 0.6.1+ snapshot with fix for OSX build [and and OSX test]

Fix --download-suitesparse for -with-shared-libraries=0

update slepc/petsc4py to latest snapshot

build: add more support for not needing to set PETSC_DIR yet build with PETSc, also support for GNU make to directly use "make test" instead of "make -f gmakefile.test"

Still needs -include ../petsc

build: add more support for not needing to set PETSC_DIR yet build with PETSc, also support for GNU make to directly use "make test" instead of "make -f gmakefile.test"

Still needs -include ../petscdir.mk in many of the makefiles
Still needs the link for ../petscdir.mk in many directories

GNUMakefile: call legacy makefile recursively instead of including it

GNUMakefile: promote default "all" target; "libs" builds libpetsc*

GNUMakefile: If gnumake < 4.2 prefer makefile wrapper interface over direct gmakefile interface to avoid the following warnings

gmakefile.test:92: arch-ci-linux-cxx-cmplx-pkgs-64idx/tests/testfiles: No such file or directory
gmakefile:67: arch-ci-linux-cxx-cmplx-pkgs-64idx/lib/petsc/conf/files: No such file or directory

Commit-type: testing-fix, feature, usability
Thanks-to: Jed Brown jed@jedbrown.org

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Configure MFEM: get the proper mpiexec command

Merge branch 'jczhang/change-build-twosided-default' into 'master'

Set the default algorithm of -build_twosided based on comm size

See merge request petsc/petsc!2611

set the default algorithm of -build_twosided based on comm size

The Allreduce algorithm performs better than the ibarrier algorithm with small number of ranks.
However, the latter scales better than

set the default algorithm of -build_twosided based on comm size

The Allreduce algorithm performs better than the ibarrier algorithm with small number of ranks.
However, the latter scales better than the former.

See more experimental results at https://gitlab.com/petsc/petsc/-/merge_requests/2611

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