Additions to some of the ADDM manual pages, a few static function additions

Commit-type: style-fix, documentation

MatAXPY_Basic: MATSHELL supports AXPY with X not of type MATSHELL

Merge branch 'hsuh/admm-wrapper' into 'master'

TAOADMM

See merge request petsc/petsc!2453

TAOADMM algorithm is implemented. Example is provided in
tomographyADMM.c

It solves f(x) + g(z) s.t. Ax + Bz = c, where user can provide A,B
Jacobian constraints, c constraint vector, and TAO constr

TAOADMM algorithm is implemented. Example is provided in
tomographyADMM.c

It solves f(x) + g(z) s.t. Ax + Bz = c, where user can provide A,B
Jacobian constraints, c constraint vector, and TAO constraints for f,g subsolvers.
Default behavior of Soft Threshold is implemented for L1 case.

remove test c file

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Add support for users to pass in FFLAGS the option for promoting integers to 8 bytes.

Tested for ifort and gfortran

Tested with MPICH and OpenMPI and MPI-Uni

Since MPI does not provide any mechani

Add support for users to pass in FFLAGS the option for promoting integers to 8 bytes.

Tested for ifort and gfortran

Tested with MPICH and OpenMPI and MPI-Uni

Since MPI does not provide any mechanism for integer promotion the code very crudely adjusts the
values in the mpif.h to mark them as 4 byte integers this is not neccessary portable for all MPI implementations

This is an extremely fragile option that we should probably not be supporting.

Users must insure their Fortran codes passes only 4 byte integers to MPI calls

PETSc Fortran examples were all fixed to explicitly use 4 byte integers for MPI calls.

Commit-type: portability-fix, testing-fix, feature
Time: 20 hours
Reported-by: Dmitry Melnichuk <dmitry.melnichuk@geosteertech.com>

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Merge remote-tracking branch 'origin/maint'

TaoTestHessian: fix memory leak

TAO: remove references to removed API from the code

TaoDefaultComputeHessian: remove redundant gradient computation

no need to sample the gradient SNESComputeJacobianDefault will do it for us

Merge remote-tracking branch 'origin/maint'

Merge remote-tracking branch 'origin/maint'

added missing cleanup for created viewer

Double CHKERRQ

For vectors it is not the Frobenius norm, merely a norm Update taosolver_fg.c

Do not default to BASIC for ASM preconditioner, it can require signifigently more iterations (and time)

Commit-type: optimization
Reported-by: Pierre Jolivet <pierre.jolivet@enseeiht.fr>

Fix item list in manpages of XXXViewFromOptions

prototype for ViewFromOptions macro-->functions

Mark/gamg eigest sa cheby

Merge remote-tracking branch 'origin/maint'

MatSetValues calls =%D => MatSetValues calls=%D

Replace use of 1 with appropriate error code; use PetscObjecComm() instead of PETSC_COMM_SELF for errors when appropriate

Commit-type: error-checking, testing-fix, style-fix, examples

Double semicolons

Remove wrong usage of int datatype from PETSc code