(svn r3730) Multistop modifications:

-Codechange: Completely rewritten the slot assignment system. It now consumes less CPU cycles and memory
-Codechange: Increased maximum number of roadstops to 16.
-Fix: Several conditions where a slot becomes unliked from a vehicle
-Codechange: ClearSlot now only takes one parameter, the vehicle
-Feature: Console command 'clearslots' to clear ALL currently assinged slots. debug usage only
-Feature: vehicles that cannot get a slot now wait on the road instead of planlessly blocking stops or circling around
-Codechange: Adjusted debug levels
TODO: Make the slot finder compatible with (a) pathfinder(s).

console_cmds.c

@@ -17,6 +17,7 @@
 #include "settings.h"
 #include "hal.h" /* for file list */
 #include "vehicle.h"
+#include "station.h"
 
 // ** scriptfile handling ** //
 static FILE *_script_file;
@@ -91,6 +92,29 @@ static void IConsoleHelp(const char *str)
 	IConsolePrintF(_icolour_warn, "- %s", str);
 }
 
+DEF_CONSOLE_CMD(ConResetSlots)
+{
+	Vehicle *v;
+	RoadStop *rs;
+	if (argc == 0) {
+		IConsoleHelp("Resets all slots in the game. For debugging only. Usage: 'clearslots'");
+		return true;
+	}
+
+	FOR_ALL_VEHICLES(v) {
+		if (IsValidVehicle(v)) {
+			if (v->type == VEH_Road)
+				ClearSlot(v);
+		}
+	}
+
+	FOR_ALL_ROADSTOPS(rs) {
+		rs->slot[0] = rs->slot[1] = INVALID_VEHICLE;
+	}
+
+	return true;
+}
+
 DEF_CONSOLE_CMD(ConStopAllVehicles)
 {
 	Vehicle* v;
@@ -1364,6 +1388,7 @@ void IConsoleStdLibRegister(void)
 	IConsoleCmdRegister("cd",           ConChangeDirectory);
 	IConsoleCmdRegister("pwd",          ConPrintWorkingDirectory);
 	IConsoleCmdRegister("clear",        ConClearBuffer);
+	IConsoleCmdRegister("clearslots",   ConResetSlots);
 	IConsoleCmdRegister("stopall",      ConStopAllVehicles);
 
 	IConsoleAliasRegister("dir",      "ls");