BUG: lagrangian: PatchInteractionModel was not initialising statistics counters

Fixed #55.

src/lagrangian/intermediate/submodels/Kinematic/PatchInteractionModel/PatchInteractionModel/PatchInteractionModel.C

@@ -3,7 +3,7 @@
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
     \\  /    A nd           | Copyright (C) 2011-2015 OpenFOAM Foundation
-     \\/     M anipulation  |
+     \\/     M anipulation  | Copyright (C) 2016 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -110,7 +110,9 @@ Foam::PatchInteractionModel<CloudType>::PatchInteractionModel
 )
 :
     CloudSubModelBase<CloudType>(owner),
-    UName_("unknown_UName")
+    UName_("unknown_UName"),
+    escapedParcels_(0),
+    escapedMass_(0.0)
 {}