disable python2 support - now python3.4+ is required
- update CI tests to use python3
- continue to use python2 on MacOS CI [due to python3 issues on 10.15.7]

Correct CXX flag for getautoconfargs

/spend 5m

petscmpiexec: accept -np flag as well as -n

Merge remote-tracking branch 'origin/release'

Make petscnagfor robust to occasional license failures
if the Nag license server is down the GitLab CI job is marked as allow_failure (while regular success/failure state of jobs is preserved)

Commi

Make petscnagfor robust to occasional license failures
if the Nag license server is down the GitLab CI job is marked as allow_failure (while regular success/failure state of jobs is preserved)

Commit-type: CI

/spend 45m

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Updated TAS

Cleanup of introduction of PetscCall()

* remove bogus error flags from XXXBegin()/End() macros such as PetscOptionsBegin()/End()

* rename for consistency certain XXXBegin()/End() macros such as Mat

Cleanup of introduction of PetscCall()

* remove bogus error flags from XXXBegin()/End() macros such as PetscOptionsBegin()/End()

* rename for consistency certain XXXBegin()/End() macros such as MatPreallocateInitialize()/Finalize()

* fix many lingering ierr = XXX that arose from multiline function calls

* sync slepc/hpddm - to use snapshots with the same changes

Commit-type: error-checking, style-fix
/spend 8h

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Remove contrib directory to remove PETSc fun3d

Just not worth the hassle to maintain

/spend 5m

Config: Add a test for symbol export from an executable
- obviously this can be improved
- Also needed a more robust naming check in Plex ex5

Docs: remove concepts

Merge remote-tracking branch 'origin/release'

doc: fix location of manual.pdf in tarball

doc fixes

CI get 'manualpages.err' on stdout

sed: -e expression #1, char 34: Invalid range end
Error! No level info in file:
Could not open raja.c

- update html conversion rule
- update checkbadSource to look for PetscCall<T>() instead of CHKERR<T>()
- checkbadSource learned to look for new definitions of CHKERR-style macros