Added some missed .h files.

src/graph.h

@@ -0,0 +1,20 @@
+/**
+* @file graph.h
+* Header file for Various graph algorithms.
+* 
+* Part of the core tbaMUD source code distribution, which is a derivative
+* of, and continuation of, CircleMUD.
+*                                                                        
+* All rights reserved.  See license for complete information.                                                                
+* Copyright (C) 1993, 94 by the Trustees of the Johns Hopkins University 
+* CircleMUD is based on DikuMUD, Copyright (C) 1990, 1991.               
+*
+* @todo the functions here should perhaps be a part of another module?
+*/
+#ifndef _GRAPH_H_
+#define _GRAPH_H_
+
+ACMD(do_track);
+void hunt_victim(struct char_data *ch);
+
+#endif /* _GRAPH_H_*/