PCHYPRE: add few more customizations

expose keeptranspose
use GetArrayWrite for PCApply output
expose few more interpolation types for boomerAMG

PCBJacobi: same Single and Multiblock behavior

Merge remote-tracking branch 'origin/release'

PCHypre: Added blank line before Options Database Keys.

PCMG: add support for PCMatApply

PCBDDC: fix bug when coordinates are not passed

Merge remote-tracking branch 'origin/release'

PCASM: remove unnecessary checks

Merge remote-tracking branch 'origin/release' into main

PCShellSetMatApply(): Correction to header of documentation

Merge branch 'jczhang/sf-change-api' into 'main'

Change some SF APIs mentioned in the ECP paper

See merge request petsc/petsc!3659

SF: add an MPI_Op argument to SFBcast

Documentation fixes

PCHPDDM: query GenEO variables in Pmat as well

Replace MPIU_REPLACE with MPI_REPLACE

Since we believe all MPI implementations support MPI_REPLACE

ShareSubPC -> ShareSubKSP

PCHPDDM: pattern of Dirichlet instead of Neumann

git: switch default branch from 'master' to 'main'

checkbadSource: new rule for wrongfully placed "{"

CHKERRQ() -> CHKERRMPI()

Merge branch 'jolivet/feature-propagate-share' into 'master'

Propagate prefix name in PC[ASM|BJACOBI|GASM] and share factorizations in PCHPDDM

See merge request petsc/petsc!3608

Merge branch 'barry/2021-01-16/add-hypre-add-euclid-options' into 'master'

Add -pc_hypre_euclid_droptolerance and -pc_hypre_euclid_bj options

See merge request petsc/petsc!3567

PCHPDDM: add PCHPDDMGetSTShareSubPC()

PCASM: properly reset composed functions

PC[ASM|BJACOBI|GASM]: propagate prefix from parent