PetscOptionsInsertFile: Refactor to better support YAML options

* Filenames with '.yaml' or '.yml' extension are inserted as YAML options
* Appending ':yaml' to a filename forces insertion as YAML o

PetscOptionsInsertFile: Refactor to better support YAML options

* Filenames with '.yaml' or '.yml' extension are inserted as YAML options
* Appending ':yaml' to a filename forces insertion as YAML option

The previous rules propagate to PetscInitialize(..., file, ...) as well as
command line option `-options_file`

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YAML: Inserting all files/strings seen in other files and command line

PetscOptions: Add public #define PETSC_MAX_OPTION_NAME

PetscOptionsInsertArgs: Remove workarounds for legacy MPICH-1 P4

Merge remote-tracking branch 'origin/release'

Merge branch 'dalcinl/options-yaml-release' into 'release'

dalcinl/options-yaml-release

See merge request petsc/petsc!3641

PetscOptionsPrefixPush: Accept numbers if the stack is not empty

PetscOptionsClearValue: Also clear 'help_intro' slot

PetscOptionsDestroyDefault: Fix possible NULL-dereference

PetscOptionsUsed: Fix for case-insensitive string comparison

Merge branch 'dalcinl/options-yaml' into 'master'

Enancements to YAML options

See merge request petsc/petsc!3618

Enhancements to YAML options

* Pass PetscOptions object to PetscOptionsInsertFileYAML().

* PetscOptionsInsert{File|String}YAML() are now always available and
will fail at runtime if PETSc was not

Enhancements to YAML options

* Pass PetscOptions object to PetscOptionsInsertFileYAML().

* PetscOptionsInsert{File|String}YAML() are now always available and
will fail at runtime if PETSc was not configured with YAML.

* Mapping keys starting with '$$' are considered dummy and not inserted.
These keys can be used with `!include` tags and for the definition of
YAML anchors to be expanded later with the merge key '<<'.

* Sequences of one-mappings insert an option with the list of keys.
For example, the following YAML options

```yaml
map:
- key0: abc
- key1: xyz
- key2: 123
```

insert the following options

```
-map key0,key1,key2
-map_key0 abc
-map_key1 xyz
-map_key2 123
```

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PetscOptionsInsertFile: Run PetscStrreplace() on input filename

Merge remote-tracking branch 'origin/release'

Merge branch 'haplav/fix-help-option' into 'release'

Consume -help in PetscOptionsSetValue() so it can be set from RC file etc.

See merge request petsc/petsc!3537

Consume -help in PetscOptionsSetValue() so it can be set from RC file etc.

Fix #795

Merge branch 'barry/2020-10-08/fix-mpi-error-codes' into 'master'

Convert MPI error type to PETSc error with string message for all MPI calls

See merge request petsc/petsc!3326

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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Merge branch 'barry/2020-09-01/fix-mpi-network-problem' into 'master'

Add additional checks and more helpful error messages if network issues...

See merge request petsc/petsc!3175

Add additional checks and more helpful error messages if network issues prevent mpiexec from working

Commit-type: error-checking, testing-fix, configure, debugability
/spend 45m
Reported-by: Eugene

Add additional checks and more helpful error messages if network issues prevent mpiexec from working

Commit-type: error-checking, testing-fix, configure, debugability
/spend 45m
Reported-by: Eugene Y Yan <eyan@anl.gov>

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Merge branch 'psanan/petscoptionsgetstringarray-man-page-fix' into 'master'

Docs: PetscOptionsGetStringArray() man page clarification

See merge request petsc/petsc!3160

Docs: PetscOptionsGetStringArray() man page clarification

Note more forcefully that one parameter is used for both input and output.

Merge branch 'haplav/remove-h-v-options' into 'master'

remove -h -v options and wipe them out from docs

See merge request petsc/petsc!2929

remove -h -v options

Merge branch 'haplav/improve-options-monitor' into 'master'

improve options monitor

See merge request petsc/petsc!2912