Kill obsolete amSupernode method -- we now have no differing behaviors.

node/Topology.hpp

@@ -156,11 +156,6 @@ public:
 		return _supernodeAddresses;
 	}
 
-	/**
-	 * @return True if this node's identity is in the supernode set
-	 */
-	inline bool amSupernode() const { return _amSupernode; }
-
 	/**
 	 * Clean and flush database
 	 */