LESfilter: Allow the name of the filter sub-dict to be specified by New

Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1659

src/TurbulenceModels/turbulenceModels/LES/LESfilters/LESfilter/LESfilter.C

@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2011 OpenFOAM Foundation
+    \\  /    A nd           | Copyright (C) 2011-2015 OpenFOAM Foundation
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -40,10 +40,11 @@ namespace Foam
 Foam::autoPtr<Foam::LESfilter> Foam::LESfilter::New
 (
     const fvMesh& mesh,
-    const dictionary& dict
+    const dictionary& dict,
+    const word& filterDictName
 )
 {
-    const word filterType(dict.lookup("filter"));
+    const word filterType(dict.lookup(filterDictName));
 
     dictionaryConstructorTable::iterator cstrIter =
         dictionaryConstructorTablePtr_->find(filterType);

src/TurbulenceModels/turbulenceModels/LES/LESfilters/LESfilter/LESfilter.H

@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2011 OpenFOAM Foundation
+    \\  /    A nd           | Copyright (C) 2011-2015 OpenFOAM Foundation
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -102,7 +102,8 @@ public:
         static autoPtr<LESfilter> New
         (
             const fvMesh&,
-            const dictionary&
+            const dictionary&,
+            const word& filterDictName="filter"
         );