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Feature/free boundary condition

Merged Feature/free boundary condition
feature/free-boundary-condition into develop
Merged Stéphane Del Pino requested to merge feature/free-boundary-condition into develop
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    The aim of this kind of boundary condition descriptor is to indicate
that as "special" treatment is to be performed for a boundary that
is not subject to a boundary condition at the continuous level.

For instance it may occur when using a centered scheme to discretize a
system which has only one wave (quite often with scalar laws:
transport, traffic flow,...)

It can be used both to change locally the scheme and to check that no
boundary has been forgotten in the description
src/language/modules/SchemeModule.cpp
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@@ -6,6 +6,7 @@
#include <mesh/Mesh.hpp>
#include <scheme/DirichletBoundaryConditionDescriptor.hpp>
#include <scheme/FourierBoundaryConditionDescriptor.hpp>
#include <scheme/FreeBoundaryConditionDescriptor.hpp>
#include <scheme/IBoundaryConditionDescriptor.hpp>
#include <scheme/IBoundaryDescriptor.hpp>
#include <scheme/NamedBoundaryDescriptor.hpp>