More warnings
Fix warnings
Clang complains about unnecessary typenames
Preprocessor macros to generate scale_sumN/for_eachN functors.
Trivial algebra for OpenMP #6
OpenMP state #5, algebra #6 and resizer #7
State splits a given Range into an InnerState, one for each thread. The algebra's for_eachN calls for_eachN in parallel on each part, using the InnerState's algebra. There's an openmp_wrapper to parallelize the system function; this needs a way to pass on the offset.

The idea was that this design should allow using OpenMP on each MPI node with a single-threaded inner_state: mpi_state< openmp_state< inner_state > > with mpi_wrapper(openmp_wrapper(system_function))
Allow any kind of functor in openmp_wrapper #6
Adjust gcc/clang warnings
Add all external test cases to Jamroot
ICC has problems with these tests.
MPL errors (?!) and numerical errors (probably due to optimization)
Remove OpenMP system function wrapper.
Not very useful and doesn't cover all forms.
Reorganize OpenMP algebra and state. #5 #6 #7
openmp_range_algebra: parallel for over a random access container.
openmp_nested_algebra: processs parts of a split container in parallel.
openmp_state: a split container based on vector<vector<>>.
openmp_algebra: use a range_algebra on each part of that container.
Update Lorenz ensemble sample to new OpenMP algebra
1D-chain performance test. #3
Based on <https://github.com/mariomulansky/hpx_odeint/tree/9792ca4f330bf0cffde4f000e900fb4c1c254891/osc_chain_1d/openmp2>

Use osc_chain_speedup.{sh,gnu} to compute and plot speedup.
"split" uses openmp_state/openmp_algebra;
"simple" uses vector/openmp_range_algebra
Reuse value from previous iteration in simple case too. #3
From <https://github.com/mariomulansky/hpx_odeint/blob/9792ca4f330bf0cffde4f000e900fb4c1c254891/osc_chain_1d/openmp/system.hpp>.
Makes simple/split times comparable (change is minimal though).
Fix wrong index in OpenMP osc_chain_1d
Show perfect speedup in OpenMP plot
MPI state and algebra #9 #10
Unit tests for MPI state #9, resize #11 and reduction #12
MPI osc_chain_1d benchmark #4