ENH: renamed piso dictionary pisoDict

src/finiteVolume/cfdTools/general/include/readPISOControls.H

-    const dictionary& piso = mesh.solutionDict().subDict("PISO");
+    const dictionary& pisoDict = mesh.solutionDict().subDict("PISO");
 
     const int nOuterCorr =
-        piso.lookupOrDefault<int>("nOuterCorrectors", 1);
+        pisoDict.lookupOrDefault<int>("nOuterCorrectors", 1);
 
     const int nCorr =
-        piso.lookupOrDefault<int>("nCorrectors", 1);
+        pisoDict.lookupOrDefault<int>("nCorrectors", 1);
 
     const int nNonOrthCorr =
-        piso.lookupOrDefault<int>("nNonOrthogonalCorrectors", 0);
+        pisoDict.lookupOrDefault<int>("nNonOrthogonalCorrectors", 0);
 
     const bool momentumPredictor =
-        piso.lookupOrDefault("momentumPredictor", true);
+        pisoDict.lookupOrDefault("momentumPredictor", true);
 
     const bool transonic =
-        piso.lookupOrDefault("transonic", false);
+        pisoDict.lookupOrDefault("transonic", false);