(svn r1479) -Added highscore chart (accessible from the difficulty window) with top5 companies for a given difficulty (select the difficulty in the menu)

-Added endgame score on 1 jan 2051 where you are added to the highscore if sufficiently large points have been accumulated. Game is paused while
-These values are saved in hs.dat; added read/write functions for it
-Added code to delete all windows to show charts. There is one issue left: somehow a news-gui pops up in front of the the chart at the end of the game.

player.h

@@ -201,4 +201,15 @@ VARDEF Player _players[MAX_PLAYERS];
 #define IS_HUMAN_PLAYER(p) (!DEREF_PLAYER((byte)(p))->is_ai)
 #define IS_INTERACTIVE_PLAYER(p) (((byte)p) == _local_player)
 
+typedef struct HighScore {
+	char company[100];
+	StringID title;
+	uint16 score;
+} HighScore;
+
+VARDEF HighScore _highscore_table[4][5]; // 4 difficulty-settings; top 5
+void SaveToHighScore(void);
+void LoadFromHighScore(void);
+int SaveHighScoreValue(const Player *p);
+
 #endif /* PLAYER_H */