ENH: use simpler boundBox handling

- use default initialize boundBox instead of invertedBox
- reset() instead of assigning from invertedBox
- extend (three parameter version) and grow method
- inflate(Random) instead of extend + re-assigning

applications/utilities/surface/surfaceHookUp/surfaceHookUp.C

@@ -178,12 +178,9 @@ void createBoundaryEdgeTrees
         // geometry there are less face/edge aligned items.
         treeBoundBox bb
         (
-            treeBoundBox(UList<point>(surf.localPoints())).extend(rndGen, 1e-4)
+            treeBoundBox(surf.localPoints()).extend(rndGen, 1e-4, ROOTVSMALL)
         );
 
-        bb.min() -= point::uniform(ROOTVSMALL);
-        bb.max() += point::uniform(ROOTVSMALL);
-
         bEdgeTrees.set
         (
             surfI,

applications/utilities/surface/surfaceRedistributePar/surfaceRedistributePar.C

@@ -193,10 +193,7 @@ int main(int argc, char *argv[])
         meshBb[Pstream::myProcNo()] = List<treeBoundBox>
         (
             1,
-            treeBoundBox
-            (
-                boundBox(mesh.points(), false)
-            ).extend(rndGen, 1e-3)
+            treeBoundBox(mesh.points()).extend(rndGen, 1e-3)
         );
         Pstream::allGatherList(meshBb);
     }
@@ -243,7 +240,7 @@ int main(int argc, char *argv[])
         }
         else
         {
-            bbs = List<treeBoundBox>(1, treeBoundBox(boundBox::invertedBox));
+            bbs = List<treeBoundBox>(1, treeBoundBox::null());
         }
 
         dictionary dict;