#1049 [DOES NOT COMPILE EVERYTHING] Move DomainManager outside of Internal namespace.

Data/Lua/demo_input_elasticity.lua

Data/Lua/demo_input_elasticity_3d.lua

Data/Lua/demo_input_hyperelasticity.lua

Data/Lua/demo_input_hyperelasticity_3d.lua

HappyHeart.xcodeproj/project.pbxproj

...shareddata/xcschemes/Hyperelasticity_CG_half_sum.xcscheme

.../BoundaryConditions/DirichletBoundaryConditionManager.hpp

.../BoundaryConditions/DirichletBoundaryConditionManager.hxx

Sources/FiniteElement/FiniteElementSpace/FEltSpace.hpp

...s/FiniteElement/FiniteElementSpace/Internal/FEltSpace.hpp

...s/FiniteElement/FiniteElementSpace/Internal/FEltSpace.hxx

Sources/Geometry/Domain/Domain.hpp

Sources/Geometry/Domain/DomainManager.cpp

Sources/Geometry/Domain/DomainManager.hpp

Sources/Geometry/Domain/DomainManager.hxx

Sources/Geometry/Domain/Internal/DomainManager.cpp

Sources/Geometry/Domain/Internal/DomainManager.hpp

Sources/Geometry/Domain/Internal/DomainManager.hxx

Sources/Geometry/Mesh/Internal/PseudoNormalsManager.cpp

Sources/Geometry/Mesh/Internal/PseudoNormalsManager.hpp