optimize comm : remove mpi::all_to_all
use the new elementsGhost container
use new container for ghost elements which share the entity
add functor : UpdateNeighborPartition
fix face.G() and face.vertices() with 1d mesh
optimize comm : remove mpi::all_to_all
minor up : use stencilManagerAdd function
major update with doftable // :
 - some optimizations
 - remove mpi::all_to_all
 - fix discontinuous space (when a process have no dof)
 - genericity (1d is not a particular case now)
-fix create submesh with the new version of parallel doftable
-some type clean
up stokes_dirichletlm example
up laplacian_block example
Merge branch 'develop' of https://github.com/feelpp/feelpp into develop