Re-add test_required_examples for proper title and pdf file name

Update postprocessing scripts

Add PETSc BP2, BP4, BP5, BP6 (#243)

* Add PETSc BP2, BP4, BP5, BP6

* Documentation update

* Update make benchmark

* Minor changes

* Add PETSc bpData structure

* Update make benchmarks

Add PETSc BP2, BP4, BP5, BP6 (#243)

* Add PETSc BP2, BP4, BP5, BP6

* Documentation update

* Update make benchmark

* Minor changes

* Add PETSc bpData structure

* Update make benchmarks

* Benchmark - use default qextra

* Documentation fix

* Clean up PETSc bps.c, add benchmarking first run

* Drop -ksp_max_it from benchmarkscript

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Benchmarking (#187)

* Add make benchmarks

* Various tweaks related to the benchmarks.

* In Makefile:
* target 'all' now builds the library, all tests and examples
* the old 'all' target is n

Benchmarking (#187)

* Add make benchmarks

* Various tweaks related to the benchmarks.

* In Makefile:
* target 'all' now builds the library, all tests and examples
* the old 'all' target is now called 'par'
* the target 'examples' will build also the MFEM and PETSc examples if
the respective library is available.

In the benchmarks/ directory:
* remove 'config.sh'
* cleanup unused stuff from 'benchmark.sh'.

* Fix postprocess scripts, convert to Python 3

* Small update in README.md

* Set benchmark cg its max, update gitignore

* Minor makefile fix

* In Makefile, add 'par' to the list of phony targets.

* In benchmarks/postprocess-table.py, sort the table by backend first.

* Small update in examples/petsc/Makefile - add a comment that
PETSC_ARCH can be undefined/empty, e.g. when using PETSc installed
through Spack.

* In Makefile, update the benchmarking targets:
* add separate targets for individual tests: `bench-petsc-bp1`,
`bench-petsc-bp3`, etc
* `make benchmarks` runs all defined benchmarks.

Update README.md to reflect the above changes.

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