fix parallel domain decomposition

Conflicts:
	feel/feelalg/graphcsr.cpp
	feel/feelalg/matrixpetsc.cpp
	feel/feeldiscr/createsubmesh.hpp
	feel/feeldiscr/stencil.hpp
	feel/feelfilters/importergmsh.hpp

(cherry picked from commit 7ed1635fd2f93c11fe2a515b69f1b5d45d694a4c)

Conflicts:
	feel/feeldiscr/createsubmesh.hpp