ENH: more consistent use of broadcast, combineReduce etc.

- broadcast           : (replaces scatter)
  - combineReduce       == combineGather + broadcast
  - listCombineReduce   == listCombineGather + broadcast
  - mapCombineReduce    == mapCombineGather + broadcast
  - allGatherList       == gatherList + scatterList

  Before settling on a more consistent naming convention,
  some intermediate namings were used in OpenFOAM-v2206:

    - combineReduce       (2206: combineAllGather)
    - listCombineReduce   (2206: listCombineAllGather)
    - mapCombineReduce    (2206: mapCombineAllGather)

src/sampling/probes/patchProbes.C

@@ -166,7 +166,7 @@ void Foam::patchProbes::findElements(const fvMesh& mesh)
 
 
     // Find nearest - globally consistent
-    Pstream::listCombineAllGather(nearest, mappedPatchBase::nearestEqOp());
+    Pstream::listCombineReduce(nearest, mappedPatchBase::nearestEqOp());
 
     oldPoints_.resize(this->size());
 

src/sampling/probes/patchProbesTemplates.C

@@ -111,7 +111,7 @@ Foam::patchProbes::sample(const VolumeField<Type>& vField) const
         }
     }
 
-    Pstream::listCombineAllGather(values, isNotEqOp<Type>());
+    Pstream::listCombineReduce(values, isNotEqOp<Type>());
 
     return tvalues;
 }
@@ -141,7 +141,7 @@ Foam::patchProbes::sample(const SurfaceField<Type>& sField) const
         }
     }
 
-    Pstream::listCombineAllGather(values, isNotEqOp<Type>());
+    Pstream::listCombineReduce(values, isNotEqOp<Type>());
 
     return tvalues;
 }

src/sampling/probes/probesTemplates.C

@@ -225,7 +225,7 @@ Foam::probes::sample(const VolumeField<Type>& vField) const
         }
     }
 
-    Pstream::listCombineAllGather(values, isNotEqOp<Type>());
+    Pstream::listCombineReduce(values, isNotEqOp<Type>());
 
     return tvalues;
 }
@@ -248,7 +248,7 @@ Foam::probes::sample(const SurfaceField<Type>& sField) const
         }
     }
 
-    Pstream::listCombineAllGather(values, isNotEqOp<Type>());
+    Pstream::listCombineReduce(values, isNotEqOp<Type>());
 
     return tvalues;
 }

src/sampling/sampledSet/cloud/cloudSet.C

@@ -84,8 +84,8 @@ void Foam::cloudSet::calcSamples
             minFoundProc[i] = foundProc[i];
         }
     }
-    Pstream::listCombineAllGather(minFoundProc, minEqOp<label>());
-    Pstream::listCombineAllGather(maxFoundProc, maxEqOp<label>());
+    Pstream::listCombineReduce(minFoundProc, minEqOp<label>());
+    Pstream::listCombineReduce(maxFoundProc, maxEqOp<label>());
 
 
     DynamicField<point> missingPoints(sampleCoords_.size());

src/sampling/sampledSet/patchCloud/patchCloudSet.C

@@ -155,7 +155,7 @@ void Foam::patchCloudSet::calcSamples
 
 
     // Find nearest - globally consistent
-    Pstream::listCombineAllGather(nearest, mappedPatchBase::nearestEqOp());
+    Pstream::listCombineReduce(nearest, mappedPatchBase::nearestEqOp());
 
 
     if (debug && Pstream::master())

src/sampling/sampledSet/patchSeed/patchSeedSet.C

@@ -178,11 +178,7 @@ void Foam::patchSeedSet::calcSamples
             // 2. Reduce on master. Select nearest processor.
 
             // Find nearest - globally consistent
-            Pstream::listCombineAllGather
-            (
-                nearest,
-                mappedPatchBase::nearestEqOp()
-            );
+            Pstream::listCombineReduce(nearest, mappedPatchBase::nearestEqOp());
 
             // 3. Pick up my local faces that have won
 

src/sampling/sampledSet/sampledSets/sampledSets.C

@@ -196,7 +196,7 @@ Foam::IOobjectList Foam::sampledSets::preCheckFields(unsigned request)
 
     // Parallel consistency (no-op in serial)
     // Probably not needed...
-    /// Pstream::mapCombineAllGather(selected, HashSetOps::plusEqOp<word>());
+    /// Pstream::mapCombineReduce(selected, HashSetOps::plusEqOp<word>());
 
 
     DynamicList<label> missed(fieldSelection_.size());

src/sampling/sampledSet/shortestPath/shortestPathSet.C

@@ -264,7 +264,7 @@ void Foam::shortestPathSet::sync
             celli,
             Tuple2<point, bool>(origin, findMinDistance)
         );
-        Pstream::combineAllGather
+        Pstream::combineReduce
         (
             searchData,
             [](ProcData& x, const ProcData& y)

src/sampling/sampledSurface/sampledMeshedSurface/sampledMeshedSurface.C

@@ -227,7 +227,7 @@ bool Foam::sampledMeshedSurface::update(const meshSearch& meshSearcher)
     // See which processor has the nearest. Mark and subset
     // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-    Pstream::listCombineAllGather(nearest, minFirstEqOp<scalar>{});
+    Pstream::listCombineReduce(nearest, minFirstEqOp<scalar>{});
 
     labelList cellOrFaceLabels(fc.size(), -1);
 

src/sampling/sampledSurface/sampledSurfaces/sampledSurfaces.C

@@ -119,7 +119,7 @@ Foam::IOobjectList Foam::sampledSurfaces::preCheckFields()
     }
 
     // Parallel consistency (no-op in serial)
-    Pstream::mapCombineAllGather(selected, HashSetOps::plusEqOp<word>());
+    Pstream::mapCombineReduce(selected, HashSetOps::plusEqOp<word>());
 
 
     DynamicList<label> missed(fieldSelection_.size());

src/sampling/surface/isoSurface/isoSurfacePoint.C

@@ -262,7 +262,7 @@ void Foam::isoSurfacePoint::syncUnseparatedPoints
         }
 
         // Globally consistent
-        Pstream::listCombineAllGather(sharedPts, minEqOp<point>());
+        Pstream::listCombineReduce(sharedPts, minEqOp<point>());
 
         // Now we will all have the same information. Merge it back with
         // my local information.