Merge branch 'barry/2021-06-10/fix-chkerrq' into 'main'

Fix missing ierr =, removed incorrect CHKERRQ(), change CHKStringError

See merge request petsc/petsc!4078

Fix missing ierr =, removed incorrect CHKERRQ()

Commit-type: error-checking, style-fix
\spend 45m

Mat: add code to view Mvctx

Style: replace "!rank" with "rank == 0"

In SF tutorial ex1 (src/vec/is/sf/tutorials/ex1.c), add parentheses around "rank == 0". This is relevant because ! binds more tightly than +, but == binds les

Style: replace "!rank" with "rank == 0"

In SF tutorial ex1 (src/vec/is/sf/tutorials/ex1.c), add parentheses around "rank == 0". This is relevant because ! binds more tightly than +, but == binds less
tightly, so the result of the computation would otherwise change.

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Merge branch 'hzhang/tao-pdipm-update' into 'main'

add PCSetPreSolve(); resolve remaining issues of MR3821

See merge request petsc/petsc!4120

Merge branch 'jed/rm-distutils' into 'main'

config: remove distutils from build

See merge request petsc/petsc!4253

address issues raised by Barry for MR3821
fix a comment in mumps.c
add PCSetPreSolve(); rm several private '#include'; cleanup KKTAddShifts(), PCPreSolve_PDIPM(), TaoSetup_PDIPM()
add 'requires: mump

address issues raised by Barry for MR3821
fix a comment in mumps.c
add PCSetPreSolve(); rm several private '#include'; cleanup KKTAddShifts(), PCPreSolve_PDIPM(), TaoSetup_PDIPM()
add 'requires: mumps' to src/tao/constrained/tutorials/ex1.c' -- pdipm cannot handle zeropivot yet
update ex1 for distributed Hessian and Jacobians
update webmanual
update tao->gnorm0 and tao->step = mu in TaoSNESFunction_PDIPM_residual()

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Fix spelling errors in manpages and comments

config: remove distutils from build

distutils is deprecated and will be removed in Python-3.12:

https://www.python.org/dev/peps/pep-0632/

Most features carry over readily with sysconfig (part of

config: remove distutils from build

distutils is deprecated and will be removed in Python-3.12:

https://www.python.org/dev/peps/pep-0632/

Most features carry over readily with sysconfig (part of minimal python,
unlike distutils, which is often an optional package). One exception is
distutils.sysconfig.parse_makefile, which is more full-featured than
sysconfig._parse_makefile (a private method that exists in python 2.7
and all tested python 3 versions). Specifically, _parse_makefile()
cannot handled lines continued with trailing backslash (\) and thus we
must forbid continuations for DIRS and SOURCE* lines -- just use a line
as long as it needs to be. This system will hopefully be renovated anyway.

Commit-type: portability

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Merge remote-tracking branch 'origin/release'

Fix subroutine name in fortran interface

Mat: more on removing the unneeded +1 in memory allocation for garray

SPQR: support for MATNORMAL

Some missing CHKERR[Q|MPI]