possibility to extend the // doftable on some ghost element (which touch the interprocess faces)
add parameters in functionspace to take into account the extended doftable
add boost parameter
 accept extended stencil with ghost elt
fix projector : Pattern::EXTENDED is uselessgit diff projector.hpp and also the default backend ( Backend<double>::build( BACKEND_PETSC ) is obselete I think )
reactivate integrate on interprocess faces
use Pdh instead of Odh and use extended dof table in //
up rebuildDofPoints with extended doftable
Merge branch 'develop' into feature/header

Conflicts:
	feel/feeldiscr/functionspace.hpp
fix clang compilation
fix composite space with extended doftable
fix parameter broadcast when sampling WNmu is randomly choosen. However it seems there is a convergence problem with transient problems...
update issue #226
Merge branch 'feature/header' of https://github.com/feelpp/feelpp into feature/header

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fix parallelism
add a test using bdf
fix compilation update issue #226
update issue #226: work on tutorial to reduce compilation time
Merge remote-tracking branch 'origin/develop' into feature/header

Conflicts:
	feel/feeldiscr/functionspace.hpp
	feel/feeldiscr/projector.hpp
update issue #226: add domain.hpp
call start to update bdf coefficients (update issue #237)