Add zone descriptor and displace boundary descriptor to MeshModule

src/language/modules/MeshModule.cpp

@@ -26,6 +26,8 @@
 MeshModule::MeshModule()
 {
   this->_addTypeDescriptor(ast_node_data_type_from<std::shared_ptr<const IMesh>>);
+  this->_addTypeDescriptor(ast_node_data_type_from<std::shared_ptr<const IBoundaryDescriptor>>);
+  this->_addTypeDescriptor(ast_node_data_type_from<std::shared_ptr<const IZoneDescriptor>>);
 
   this->_addBuiltinFunction("readGmsh",
                             std::make_shared<BuiltinFunctionEmbedder<std::shared_ptr<const IMesh>(const std::string&)>>(

src/language/modules/SchemeModule.cpp

@@ -45,7 +45,6 @@ SchemeModule::SchemeModule()
   this->_addTypeDescriptor(ast_node_data_type_from<std::shared_ptr<const IDiscreteFunctionDescriptor>>);
   this->_addTypeDescriptor(ast_node_data_type_from<std::shared_ptr<const IQuadratureDescriptor>>);
 
-  this->_addTypeDescriptor(ast_node_data_type_from<std::shared_ptr<const IBoundaryDescriptor>>);
   this->_addTypeDescriptor(ast_node_data_type_from<std::shared_ptr<const IBoundaryConditionDescriptor>>);
 
   this->_addBuiltinFunction("P0", std::make_shared<