Raise max Hash to 1TB

And use size_t where appropriate, as suggested on FishCooking.

No functional change.

src/tt.h

@@ -89,12 +89,12 @@ public:
 
   const TTEntry* probe(const Key key) const;
   TTEntry* first_entry(const Key key) const;
-  void resize(uint64_t mbSize);
+  void resize(size_t mbSize);
   void clear();
   void store(const Key key, Value v, Bound type, Depth d, Move m, Value statV);
 
 private:
-  uint32_t clusterCount;
+  size_t clusterCount;
   TTCluster* table;
   void* mem;
   uint8_t generation; // Size must be not bigger than TTEntry::genBound8