update Code Snippets and their examples

slides/materialsystem.md

 ---
 title: Material system
-author: Tufan Ghosh
 ---
 
 # Introduction to DuMuX- Material system
 
-# Material system
-
 ## Challenges in simulating porous media:
 
 * Highly heterogeneous distribution of parameters and complex nonlinear material laws
 
 * Strong interconnection of properties **--->** difficult to achieve modularity
 
-
 ## Modular structure:
 
 <ins> User-defined parameters and relationships: </ins>
@@ -203,67 +199,58 @@ CompositionFromFugacities: takes all component fugacities, the temperature and p
 
 <img src="img/component-fluidsystem.png" width="500"/>
 
-## Example: 2 phases, immiscible
+## Example: 2 phases, miscible
 
  * Components: _H2O_, _Air_
- * Fluid system: _TwoPImmiscible_
+ * Fluid system: _TwoPTwoC_
 
 ## Include headers in properties file: components
 
 ```cpp
-// The numerical model
-#include <dumux/porousmediumflow/2p/implicit/model.hh>
+// The two-phase immiscible fluid system
+#include <dumux/material/fluidsystems/h2oair.hh>
 // The water component
 #include <dumux/material/components/h2o.hh>
 // The air component
 #include <dumux/material/components/air.hh>
 ```
 
-## Include headers in properties file: phases
-
-```cpp
-// The two-phase immiscible fluid system
-#include <dumux/material/fluidsystems/2pimmiscible.hh>
-// Liquid phase
-#include <dumux/material/fluidsystems/1pliquid.hh>
-// Gas phase
-#include <dumux/material/fluidsystems/1pgas.hh>
-// Solid phase
-#include <dumux/material/solidsystems/1csolid.hh>
-```
-
 ## Specify fluid system in properties file:
 
 ```cpp
-// we use the immiscible fluid system here
-SET_PROP(WaterAirProblem, FluidSystem)
+
+template<class TypeTag>
+struct FluidSystem<TypeTag, TTag::H2OAir>
 {
 private:
-using Scalar = typename GET_PROP_TYPE(TypeTag, Scalar);
-using LiquidPhase = typename FluidSystems::LiquidPhase<Scalar,
-                             H2O<Scalar> >;
-using GasPhase = typename FluidSystems::GasPhase<Scalar,
-                          Air<Scalar> >;
+    using Scalar = GetPropType<TypeTag, Properties::Scalar>;
 public:
-using type = typename FluidSystems::TwoPImmiscible<Scalar,
-                      LiquidPhase, GasPhase>;
+    using type = FluidSystems::H2OAir<Scalar,
+                 Components::TabulatedComponent<Components::H2O<Scalar>>,
+                 FluidSystems::H2OAirDefaultPolicy</*fastButSimplifiedRelations=*/true>,
+                 true /*useKelvinEquation*/>;
 };
 ```
 
 
 # Example: From component to solid system
 
+## Example: 2 phases, miscible
+
+ * Components: _CaO_, _CaO2H2_ (slaked lime)
+ * Solid system: _OnePNCMin_
+
 ## Specify solid system in properties file:
 
 ```cpp
-// we use the inert solid system here
-SET_PROP(WaterAirProblem, SolidSystem)
+// The solid system
+template<class TypeTag>
+struct SolidSystem<TypeTag, TTag::ThermoChem>
 {
-private:
-using Scalar = typename GET_PROP_TYPE(TypeTag, Scalar);
-using ComponentT = Components::Granite<Scalar>;
-public:
-using type = SolidSystems::InertSolidphase<Scalar, ComponentT>;
+    using Scalar = GetPropType<TypeTag, Properties::Scalar>;
+    using ComponentOne = Components::ModifiedCaO<Scalar>;
+    using ComponentTwo = Components::CaO2H2<Scalar>;
+    using type = SolidSystems::CompositionalSolidPhase<Scalar, ComponentOne, ComponentTwo>;
 };
 ```
 ## Note to solid system