PackedList iterator bugfix

- compare iteratorBase == iteratorBase by value, not position
  thus this works
      list[a] == list[b] ...

- compare iterator == iteratorBase and const_iterator == iteratorBase
  by position, not value. The inheritance rules means that this works:
      iter == list.end() ...
  this will compare positions:
      iter == list[5];
  Of course, this will still compare values:
      *iter == list[5];

src/OpenFOAM/containers/Lists/PackedList/PackedList.H

@@ -330,7 +330,7 @@ public:
 
             // Member Operators
 
-                //- Compare positions
+                //- Compare values (not positions)
                 inline bool operator==(const iteratorBase&) const;
                 inline bool operator!=(const iteratorBase&) const;
 
@@ -380,6 +380,10 @@ public:
 
             // Member Operators
 
+                //- Compare positions (not values)
+                inline bool operator==(const iteratorBase&) const;
+                inline bool operator!=(const iteratorBase&) const;
+
                 //- Assign from iteratorBase, eg iter = packedlist[i]
                 //  An out-of-range iterator is assigned end()
                 inline iterator& operator=(const iteratorBase&);
@@ -425,17 +429,21 @@ public:
 
                 //- Construct from iterator base, eg iter(packedlist[i])
                 //  but also  "const_iterator iter = packedlist[i];"
-                //  An out-of-range iterator is assigned end()
+                //  An out-of-range iterator is assigned cend()
                 inline const_iterator(const iteratorBase&);
 
                 //- Construct from base list and position index
                 inline const_iterator(const PackedList*, const label);
 
-                //- Construct from non-const iterator
+                //- Construct from iterator
                 inline const_iterator(const iterator&);
 
             // Member operators
 
+                //- Compare positions (not values)
+                inline bool operator==(const iteratorBase&) const;
+                inline bool operator!=(const iteratorBase&) const;
+
                 //- Assign from iteratorBase or derived
                 //  eg, iter = packedlist[i] or even iter = list.begin()
                 inline const_iterator& operator=(const iteratorBase&);

src/OpenFOAM/containers/Lists/PackedList/PackedListI.H

@@ -176,7 +176,7 @@ inline bool Foam::PackedList<nBits>::iteratorBase::operator==
     const iteratorBase& iter
 ) const
 {
-    return this->index_ == iter.index_;
+    return this->get() == iter.get();
 }
 
 
@@ -186,7 +186,7 @@ inline bool Foam::PackedList<nBits>::iteratorBase::operator!=
     const iteratorBase& iter
 ) const
 {
-    return this->index_ != iter.index_;
+    return this->get() != iter.get();
 }
 
 
@@ -311,6 +311,48 @@ inline Foam::PackedList<nBits>::const_iterator::const_iterator
 {}
 
 
+template<unsigned nBits>
+inline bool Foam::PackedList<nBits>::iterator::operator==
+(
+    const iteratorBase& iter
+) const
+{
+    return this->index_ == iter.index_;
+}
+
+
+template<unsigned nBits>
+inline bool Foam::PackedList<nBits>::iterator::operator!=
+(
+    const iteratorBase& iter
+) const
+{
+    return this->index_ != iter.index_;
+}
+
+
+
+template<unsigned nBits>
+inline bool Foam::PackedList<nBits>::const_iterator::operator==
+(
+    const iteratorBase& iter
+) const
+{
+    return this->index_ == iter.index_;
+}
+
+
+template<unsigned nBits>
+inline bool Foam::PackedList<nBits>::const_iterator::operator!=
+(
+    const iteratorBase& iter
+) const
+{
+    return this->index_ != iter.index_;
+}
+
+
+
 template<unsigned nBits>
 inline typename Foam::PackedList<nBits>::iterator&
 Foam::PackedList<nBits>::iterator::operator=(const iteratorBase& iter)