Merge remote-tracking branch 'origin/maint'

essl: fix build by protecting code with PETSC_MISSING_LAPACK_ORGQR etc flags

Reported-by: Victor Eijkhout <eijkhout@tacc.utexas.edu>

Remove usage of PETSC_HAVE_FORTRAN_STDCALL, PETSC_BLASLAPACK_STDCALL, HAVE_FORTRAN_MIXED_STR_ARG flags - as Compaq f90 compiler is no longer supported

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'

Double CHKERRQ

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>

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