ENH: 'set' instead of 'insert' std::initializer_list to HashTable

- Duplicate entries are handled by overwriting, which corresponds more
  closely to the notion of assignment

src/OpenFOAM/containers/HashTables/HashTable/HashTable.C

@@ -97,7 +97,7 @@ Foam::HashTable<T, Key, Hash>::HashTable
 {
     for (const auto& keyval : list)
     {
-        insert(keyval.first, keyval.second);
+        set(keyval.first, keyval.second);
     }
 }
 
@@ -809,7 +809,7 @@ void Foam::HashTable<T, Key, Hash>::operator=
 
     for (const auto& keyval : rhs)
     {
-        insert(keyval.first, keyval.second);
+        set(keyval.first, keyval.second);
     }
 }
 

src/OpenFOAM/containers/HashTables/HashTable/HashTable.H

@@ -222,6 +222,7 @@ public:
         HashTable(this_type&& rhs);
 
         //- Construct from an initializer list
+        //  Duplicate entries are handled by overwriting
         HashTable(std::initializer_list<std::pair<Key, T>> list);
 
 
@@ -518,6 +519,7 @@ public:
         void operator=(const this_type& rhs);
 
         //- Copy assign from an initializer list
+        //  Duplicate entries are handled by overwriting
         void operator=(std::initializer_list<std::pair<Key, T>> rhs);
 
         //- Move assign