Reduce the flow of tradeships

- reduce the flow to the most popular station in system by 40%.
- reduce the maximum station load by 25%
- reduce the maximum ships limit by 40%

This is to improve the performance. although these parameters are
independent, it is better to change them synchronously.  For example, if
you just reduce the allowable number of ships, in all systems this
number can become the same.  If the load on the station is not reduced,
the ships will stay there for too long.

data/modules/TradeShips/Core.lua

@@ -9,9 +9,9 @@ local Core = {
 	-- CONSTANTS / SETTINGS
 	AU = 149598000000.0, -- meters
 
-	MAX_ROUTE_FLOW = 3, -- flow to the most popular station in the system, ships/hour
-	MAX_BUSY = 0.4, -- maximum station load
-	MAX_SHIPS = 500, -- ~ maximim ships in open space (limitation for performance reasons)
+	MAX_ROUTE_FLOW = 1.8, -- flow to the most popular station in the system, ships/hour
+	MAX_BUSY = 0.3, -- maximum station load
+	MAX_SHIPS = 300, -- ~ maximim ships in open space (limitation for performance reasons)
 	MIN_STATION_DOCKING_TIME = 2, -- hours, minimum average time of the ship's stay at the station
 
 	WAIT_FOR_NEXT_UNDOCK = 600, -- seconds