lagrangian: Always set switchProcessor flag

The TrackData::switchProcessor flag was not being set for some of the
tracking steps made by the more complicated parcels. In the case that a
parcel starts the step already on a processor boundary, this sometimes
lead to the particle being transferred back and forth indefinitely. The
flag is now explicitly set in all cases.

src/lagrangian/intermediate/parcels/Templates/CollidingParcel/CollidingParcel.C

@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2011-2015 OpenFOAM Foundation
+    \\  /    A nd           | Copyright (C) 2011-2017 OpenFOAM Foundation
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -84,6 +84,7 @@ bool Foam::CollidingParcel<ParcelType>::move
             p.angularMomentum() += 0.5*trackTime*p.torque();
 
             td.keepParticle = true;
+            td.switchProcessor = false;
 
             break;
         }

src/lagrangian/intermediate/parcels/Templates/MPPICParcel/MPPICParcel.C

@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2013-2014 OpenFOAM Foundation
+    \\  /    A nd           | Copyright (C) 2013-2017 OpenFOAM Foundation
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -79,6 +79,7 @@ bool Foam::MPPICParcel<ParcelType>::move
                 td.cloud().dampingModel().velocityCorrection(p, trackTime);
 
             td.keepParticle = true;
+            td.switchProcessor = false;
 
             break;
         }
@@ -88,6 +89,7 @@ bool Foam::MPPICParcel<ParcelType>::move
                 td.cloud().packingModel().velocityCorrection(p, trackTime);
 
             td.keepParticle = true;
+            td.switchProcessor = false;
 
             break;
         }