ENH: relocate sortedOrder from ListOps.H to List.H

- commonly used, only depends on routines defined in UList
  (don't need the rest of ListOps for it).

ENH: implement boolList::operator() const

- allows use as a predicate functor, as per bitSet and labelHashSet

GIT: combine SubList, UList into List directory (intertwined concepts)

STYLE: default initialize DynamicList instead of with size 0

applications/test/boolList/bitSetOrBoolList.H

@@ -5,7 +5,7 @@
     \\  /    A nd           | www.openfoam.com
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
-    Copyright (C) 2020 OpenCFD Ltd.
+    Copyright (C) 2020-2022 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -32,8 +32,8 @@ Description
 
 \*---------------------------------------------------------------------------*/
 
-#ifndef bitSetOrBoolList_H
-#define bitSetOrBoolList_H
+#ifndef Foam_bitSetOrBoolList_H
+#define Foam_bitSetOrBoolList_H
 
 #include "bitSet.H"
 #include "boolList.H"
@@ -88,6 +88,13 @@ public:
         {
             return bits_.test(i) || bools_.test(i);
         }
+
+        //- Test predicate
+        bool operator()(const label i) const
+        {
+            // Can also use test(i) etc...
+            return bits_(i) || bools_(i);
+        }
 };