Doc - fix L-vector indexing in dev docs (#557)

* Doc - fix L-vector indexing in dev docs

* Doc - fix same issue in ElemRestriction doc

Improve Developer Documentation (#556)

* doc - document l/e/q vector layouts and object inheritance

* doc - clean up some referencing

* doc - fix some reference errors

* doc - fix enumerati

Improve Developer Documentation (#556)

* doc - document l/e/q vector layouts and object inheritance

* doc - clean up some referencing

* doc - fix some reference errors

* doc - fix enumeration in inheritance list

* doc - include note for dissimilar E/Q layouts

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Composite Operator support for AssembleLinearDiag/PBDiag (#552)

* ref - add composite operator support for building diagonal/pb diagonal

* ref - add error for non-composite mult-field operator di

Composite Operator support for AssembleLinearDiag/PBDiag (#552)

* ref - add composite operator support for building diagonal/pb diagonal

* ref - add error for non-composite mult-field operator diagonal/pb diagonal assembly

* tap - add t538 exclusion because OCCA does not support galleries

* tests - adjust test cases for ceed examples for test coverage

* Op - fix documentation

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CUDA/MAGMA - add AssembleLinearQFunction (#553)

* CUDA - refactor operator apply for CUDA assemble linear QF impl

* CUDA/MAGMA - add AssembleLinearQFunction

* make style

* CUDA - clean up a

CUDA/MAGMA - add AssembleLinearQFunction (#553)

* CUDA - refactor operator apply for CUDA assemble linear QF impl

* CUDA/MAGMA - add AssembleLinearQFunction

* make style

* CUDA - clean up assembleLinearQF after q/e layout refactor

* CUDA - fallback operator for cuda/gen to cuda/ref

* CUDA - use delegation for cuda/gen prefered memtype

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Merge pull request #555 from CEED/jeremy/ci-badge

README - update Travis badge

README - update Travis badge

Convert CUDA ref/reg/shared E-Layout (#554)

* tests - update tests for multiple e-layouts

* CUDA - convert ref and reg restrictions to Q-layout

* CUDA - ref/reg/shared use gen/magma E-Layout f

Convert CUDA ref/reg/shared E-Layout (#554)

* tests - update tests for multiple e-layouts

* CUDA - convert ref and reg restrictions to Q-layout

* CUDA - ref/reg/shared use gen/magma E-Layout for multi elememnt basis apply and operator apply

* CUDA/MAGMA - drop eandqdiffer and separate MAGMA operator code

* CUDA - update operator comment

* reg - clarify read/write dofs/quads

* CUDA - drop dead code

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Merge pull request #551 from CEED/valeria/benchmarking-petsc-bps

PETSc Bps: allow looping over degrees, problems and backends

examples/petsc/bps: reuse the same DMPlex for all desired BPs and CEED resources

DM partitioning and redistribution for low-order discretizations are
relatively much more expensive than a solve. Th

examples/petsc/bps: reuse the same DMPlex for all desired BPs and CEED resources

DM partitioning and redistribution for low-order discretizations are
relatively much more expensive than a solve. This way we get more
reuse from the DMPlex.

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postprocess_plot.py: style

PETSc bps & bpsraw: Remove benchmark_mode (not needed anymore) and always disregard first run performance

This is preferred for benchmarking purposes, so that we are preloading the cache;

PETSc bpsraw: always print DoFs/Sec in CG info (except when in test mode)

PETSc bps: always print DoFs/Sec in CG info (except when in test mode)

petsc/bps/README: Use code style to avoid bold type and specify FEM nodes just to avoid confusion with compute nodes

examples/petsc/bps: allow looping over problems and CEED resources.

examples/petsc/bps: add -ksp_max_it_clip and apply DRY

benchmarks: simplify and improve legacy parsing

benchmarks: add to autopep8

benchmarks: parse logs from self-contained examples/petsc/bps.c

benchmarks: script maintenance

* rename scripts to use _ instead of - (so they can be imported)
* order -> degree (remove ambiguity; the column means polynomial degree)
* postprocess_base.py: add ks

benchmarks: script maintenance

* rename scripts to use _ instead of - (so they can be imported)
* order -> degree (remove ambiguity; the column means polynomial degree)
* postprocess_base.py: add ksp_its and time_per_it

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examples/petsc/bps: support degree lists and local_nodes ranges

* print hostname, total number of ranks, and number of ranks per node
* Allow number of ranks per node to be specified (mostly in case

examples/petsc/bps: support degree lists and local_nodes ranges

* print hostname, total number of ranks, and number of ranks per node
* Allow number of ranks per node to be specified (mostly in case one has an
old MPI that doesn't support MPI_Comm_split_type) and hostname to be
specified at the command line.

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make style

CPU Impl of AssemblePointBlockDiagonal (#503)

* Operator - add AssemblePointBlockDiagonal for CPU backends, with test

* CUDA - add point block diagonal not supported message

* make style

*

CPU Impl of AssemblePointBlockDiagonal (#503)

* Operator - add AssemblePointBlockDiagonal for CPU backends, with test

* CUDA - add point block diagonal not supported message

* make style

* Operator - improve point block description

* OCCA - explicitly remove OCCA fallback to CPU assembly functions, will update after new OCCA backend

* Op - remove gap removal in point block diagonal

* Op - update diagonal assembly documentation

* Update backends/ref/ceed-ref-operator.c

Co-authored-by: Jed Brown <jed@jedbrown.org>

* style - fix extra space in * with nopad

Co-authored-by: Jed Brown <jed@jedbrown.org>

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PETSc BPs: Refactor benchmark mode to run in loop

travis-ci: MFEM_USE_SIMD=NO on ppc64le to fix build

Suggested-by: Veselin Dobrev <dobrev@llnl.gov>