ENH: consistency of HashSet setMany(), insertMany() with packed-list version

- this also provides a better separation of the intent
  (ie, inserting a single value, or inserting multiply values)

applications/utilities/surface/surfaceCheck/surfaceCheck.C

@@ -225,9 +225,9 @@ void syncEdges(const triSurface& p, labelHashSet& markedEdges)
     const edgeList& edges = p.edges();
     edgeHashSet edgeSet(2*markedEdges.size());
 
-    forAllConstIter(labelHashSet, markedEdges, iter)
+    for (const label edgei : markedEdges)
     {
-        edgeSet.insert(edges[iter.key()]);
+        edgeSet.insert(edges[edgei]);
     }
 
     forAll(edges, edgei)

applications/utilities/surface/surfaceMeshTriangulate/surfaceMeshTriangulate.C

@@ -202,11 +202,7 @@ int main(int argc, char *argv[])
             for (const wordRe& zoneName : zoneNames)
             {
                 labelList zoneIDs = findStrings(zoneName, allZoneNames);
-
-                forAll(zoneIDs, j)
-                {
-                    includeFaceZones.insert(zoneIDs[j]);
-                }
+                includeFaceZones.insertMany(zoneIDs);
 
                 if (zoneIDs.empty())
                 {