HashTable changes

- make table power-of-two, but since it seems to give 1-2% performance
  improvement, maybe forget it too.

- remove two-argument form of hashing classes and do the modulus direclty
  within HashTable instead. This simplifies things a fair bit.

- migrate Hash<void*> from db/dlLibrary to primitives/hashes/Hash

src/OpenFOAM/primitives/strings/string/string.H

@@ -89,9 +89,10 @@ public:
     class hash
     {
     public:
-        inline hash();
+        hash()
+        {}
+
         inline size_type operator()(const string&) const;
-        inline size_type operator()(const string&, const size_type) const;
     };