multiphaseEuler: phaseTransferModels::reactionDriven: Permit transfers in both directions

The syntax of this model has changed to permit transfers of species in
either direction. A list of transferring species is now given for each
phase, rather than identifying a single reacting phase. For example:

    phaseTransfer
    (
        vapour_particles
        {
            type reactionDriven;

            // TiO2 and TiO2_s are created by reactions in the vapour
            // and are then transferred to the particles
            species.vapour (TiO2 TiO2_s);

            // H2O is created by reactions in the particles and is then
            // transferred to the vapour
            species.particles (H2O);
        }
    );

tutorials/multiphaseEuler/titaniaSynthesis/constant/phaseProperties

@@ -180,9 +180,7 @@ phaseTransfer
     particles_dispersedIn_vapour
     {
         type reactionDriven;
-        reactingPhase vapour;
-        targetPhase particles;
-        species (TiO2);
+        species.vapour (TiO2);
     }
 }
 

tutorials/multiphaseEuler/titaniaSynthesisSurface/constant/phaseProperties

@@ -192,9 +192,7 @@ phaseTransfer
     particles_dispersedIn_vapour
     {
         type reactionDriven;
-        reactingPhase vapour;
-        targetPhase particles;
-        species (TiO2 TiO2_s);
+        species.vapour (TiO2 TiO2_s);
     }
 }