MatAXPY: improve error diagnostics

Mat: Move COO events out of CUSPARSE class

Fix a few typos in the code

MatSetValuesCOO: perform addition of repeated entries when INSERT_VALUES is specified

use temporary data instead of persistent storage in cusparse implementation

Minor

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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TSView now shows the number of i and rhs function and Jacobian evaluations

Commit-type: feature
/spend 30m
Reported-by: Ed Bueler
Thanks-to: Jed Brown jed@jedbrown.org

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

Minor fixes in manual pages

MATCUSPARSE: Implement fast assembly from COO data

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

SNES ex69: Added tutorial material
- Added parameter viewing
- Added GMG test

MatStash: support null values in lower level routines

Fix error with MatAXPY_Seq/MPIAIJ that lost the layout and MatStencilInfo information from the input matrix. The code has not been touched
for five years so it is odd the bug was never exposed before

Fix error with MatAXPY_Seq/MPIAIJ that lost the layout and MatStencilInfo information from the input matrix. The code has not been touched
for five years so it is odd the bug was never exposed before.

Add a precheck in MatAXPY_SeqAIJ() for identical nonzero pattern to avoid the constant recomputation of the resulting matrix.

Commit-type: optimization, bug-fix
/spend 3h
Reported-by: Ed Bueler

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