General fixes

Merge remote-tracking branch 'origin/release'

Merge branch 'jed/pcmg-transpose' into 'master'

PCMG: implement PCApplyTranspose_MG

See merge request petsc/petsc!3539

Documentation fixes

PCHPDDM: fix for KSPLSQR

PCMG: implement PCApplyTranspose_MG

A sample run:

$PETSC_ARCH/tests/ts/tutorials/advection-diffusion-reaction/ex5adj \
-pc_type mg -mg_levels_pc_type jacobi

PCBDDC: fix the benign case with MKL_PARDISO

Schur computation is buggy for symmetric indefinite factorizations
coming from saddle points
use LU and adapt pivot perturbation

PCGAMGOptProlongator_AGG: use CURAND if possible

Add -pc_hypre_euclid_droptolerance and -pc_hypre_euclid_bj options

Add test cases for Euclid

Commit-type: error-checking, feature
/spend 50m
Reported-by: Chen Gang <569615491@qq.com>

PCJACOBI: use VecAbs if present

PCBDDC: add events for solves

PCGAMG: symmetrize using AXPY

scale graph only if needed

PCGAMG: add matmat logging events

remove useless GAMG_USE_LOG macro

Fix improper use of %D

PCGAMG: clear products intermediate data when no longer needed

MatAIJCUSPARSESetGenerateTranspose: convenience function for seq and mpi

PCGAMG: improve RAP reusage

remove setup_count from data structure

PCBDDC: viennacl runs are buggy with cuda 11, switch to cusparse

PCGAMG: comments for GPU optimizations

Minor

PCGAMG: fix view operation

PCGAMG: always generate the transpose by default with CUDA

Convert MPI error type to PETSc error with string message for all MPI calls

Now PETSc examples will ONLY return PETSc error codes and never MPI error codes directly so we can understand and post-pro

Convert MPI error type to PETSc error with string message for all MPI calls

Now PETSc examples will ONLY return PETSc error codes and never MPI error codes directly so we can understand and post-process their
errors better.

The test harness will now automatically retry tests that fail with MPI, this may help with Intel MPI that produces
seemingly random failures.

Commit-type: error-checking
/spend 30m

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Merge remote-tracking branch 'origin/release'

checkbadSource: apply rules to *.cu *.cpp sources, and expand CHKERRQ check to CHKERR(Q|MPI|CUDA|CUBLAS|CUSPARSE)