Forgot one file...
Fix efff7af. Workaround for max_align_t is now detected

- add a try_compile detection for the need of max_align_t declaration.
- the clang version is unreliable.
- cf efff7af and comments.
Fix iefff7af : Correction to previous commit
[gfs,arrays] Fix index generator flat index + 1 bug in matrix_proxy

- gfs : when constructing the index, the i_flat index was not
  recomputed.
- specialize the evaluator for mesh_point: simpler, better perf. no need
  to take modulo
- [arrays] : in the special case of a proxy = same type,
  rare, e.g. g(x) << h(x), which is not usual,
  the operator = (RHS) is not taken for the class itself.
  Usual C++ pb, one needs to overload for default copy assigment.
Fix #141

- following Igor's suggestion
add test for bubble computation
added bubble test using scalar functions
Fix reinterpret_scalar_valued_gf_as_matrix_valued

- Was not correct (bubble_scalar) because of missing start_shift
  for multivar gf.
rm parameter class, fix #124

- now replaced by simpler and better code generation solution
- TODO: write the documentation, implemented for cthyb solver
[wrapper] Split the converters code, fix #121 and hello_world

- The wrapper_tools.hpp is split into several converters/xxx.hpp
- to include only on demand.
- This fixes the hello_world from the paper