(svn r3396) - Autoreplace changes:

- Change fixed array per player to a single pool. This avoids future problems
    with vehicle numbers and decreases savegame size. Engine replacements from
    previous savegames will be lost.
  - Move engine replacement code from players.c to engine.c.
                                      (thanks to blathijs for rewriting this)

openttd.c

@@ -1257,7 +1257,7 @@ bool AfterLoadGame(void)
 	 *  of course, we do need to initialize them for older savegames. */
 	if (CheckSavegameVersion(16)) {
 		FOR_ALL_PLAYERS(p) {
-			InitialiseEngineReplacement(p);
+			p->engine_renew_list = NULL;
 			p->engine_renew = false;
 			p->engine_renew_months = -6;
 			p->engine_renew_money = 100000;