ENH: Tutorial updates

tutorials/incompressible/potentialFreeSurfaceFoam/oscillatingBox/0.org/p_gh

@@ -32,7 +32,8 @@ boundaryField
     }
     floatingObject
     {
-        type            zeroGradient;
+        type            fixedFluxPressure;
+        value           uniform 0;
     }
     frontAndBack
     {

tutorials/incompressible/potentialFreeSurfaceFoam/oscillatingBox/extractHeightData

 #!/bin/sh
-awk '{print $1 " " $4}' poolHeight/0/faceSource.dat > poolHeight_vs_time
+awk '{print $1 " " $4}' postProcessing/poolHeight/0/faceSource.dat > poolHeight_vs_time