PackedList bugfix, HashTable tweak

- it was possible to create a PackedList::iterator from a
  PackedList::const_iterator and violate const-ness

- added HashTable::printInfo for emitting some information

- changed default table sizes from 100 -> 128 in preparation for future
  2^n table sizes

src/OpenFOAM/containers/HashTables/HashSet/HashSet.H

@@ -72,7 +72,7 @@ public:
     // Constructors
 
         //- Construct given initial size
-        HashSet(const label size = 100)
+        HashSet(const label size = 128)
         :
             HashTable<nil, Key, Hash>(size)
         {}