Communication must now be enabled explicitly.

The communication subsystem is now disabled until a new BiF,
enable_communication(), is called. The base scripts do this
automatically when either a Communication::Node is defined, or Bro is
asked to listen for incoming connections.

src/Expr.h

@@ -217,7 +217,6 @@ protected:
 	friend class Expr;
 	NameExpr()	{ id = 0; }
 
-	void ReferenceID();
 	void ExprDescribe(ODesc* d) const;
 
 	DECLARE_SERIAL(NameExpr);