FIX: redistributePar problems with lagrangian

- the fileHandler changes included setting cacheLevel(0) to avoid
  blocking with redistributePar. However, this meant if clouds
  were not uniformly present on all ranks the fileHandler would follow
  different code paths and lead to blocking.

  Now switch to distributed mode for the lagrangian operations within
  redistributePar based on the cacheLevel information.

FIX: avoid triggering a false processor check in argList

- when redistributing to few ranks

tutorials/mesh/parallel/filter/Allrun

@@ -3,6 +3,10 @@ cd "${0%/*}" || exit                                # Run from this directory
 . ${WM_PROJECT_DIR:?}/bin/tools/RunFunctions        # Tutorial run functions
 #------------------------------------------------------------------------------
 
+fileHandler="-fileHandler collated"
+unset fileHandler
+## decompDict5="-decomposeParDict system/decomposeParDict.5"
+
 # Create mesh
 runApplication blockMesh
 
@@ -18,12 +22,29 @@ runApplication createBaffles -overwrite
 runApplication $(getApplication)
 
 #- RedistributePar to do decomposition
-runParallel redistributePar -decompose -cellDist
+runParallel redistributePar -decompose -cellDist $fileHandler
 
 #- Continue running for a bit more
-runParallel -s parallel $(getApplication)
+runParallel -s parallel $(getApplication) $fileHandler
 
-#- Reconstruct all times
-runParallel -s 1 redistributePar -reconstruct
+if :
+then
+    #- Reconstruct all times
+    runParallel -s reconstruct \
+        redistributePar -reconstruct $fileHandler
+
+else
+    # Not yet entirely working...
+
+    #- Send to more ranks
+    runParallel -s more-ranks $decompDict5 redistributePar $fileHandler
+
+    #- Continue running for a bit more
+    runParallel -s more-ranks $decompDict5 $(getApplication) $fileHandler
+
+    #- Reconstruct all times
+    runParallel -s reconstruct $decompDict5 \
+        redistributePar -reconstruct $fileHandler -latestTime
+fi
 
 #------------------------------------------------------------------------------

tutorials/mesh/parallel/filter/system/decomposeParDict.5

@@ -0,0 +1,32 @@
+/*--------------------------------*- C++ -*----------------------------------*\
+| =========                 |                                                 |
+| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
+|  \\    /   O peration     | Version:  v2312                                 |
+|   \\  /    A nd           | Website:  www.openfoam.com                      |
+|    \\/     M anipulation  |                                                 |
+\*---------------------------------------------------------------------------*/
+FoamFile
+{
+    version     2.0;
+    format      ascii;
+    class       dictionary;
+    object      decomposeParDict;
+}
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+numberOfSubdomains 5;
+
+method          scotch;
+
+constraints
+{
+    //- Keep owner and neighbour on same processor for faces in zones:
+    faces
+    {
+        type    preserveFaceZones;
+        zones   (cycLeft cycRight);
+    }
+}
+
+
+// ************************************************************************* //