Make it possible to disable the HG linker. On non-HG systems it spits yellow

spam, so it should not load unless HG is desired.

OpenSim/Services/GridService/HypergridLinker.cs

@@ -102,6 +102,13 @@ namespace OpenSim.Services.GridService
 
         public HypergridLinker(IConfigSource config, GridService gridService, IRegionData db)
         {
+            IConfig modulesConfig = config.Configs["Modules"];
+			if (modulesConfig == null)
+				return;
+
+			if (modulesConfig.GetString("HypergridLinker", "") != "HypergridLinker")
+				return;
+
             m_log.DebugFormat("[HYPERGRID LINKER]: Starting with db {0}", db.GetType());
 
             m_Database = db;

bin/config-include/GridHypergrid.ini

@@ -26,6 +26,7 @@
     LandServices            = "RemoteLandServicesConnector"
 	FriendsModule			= "HGFriendsModule"
 	MapImageService			= "MapImageServiceModule"
+	HypergridLinker         = "HypergridLinker"
     
     LandServiceInConnector			= true
     NeighbourServiceInConnector		= true

bin/config-include/HyperSimianGrid.ini

@@ -40,6 +40,7 @@
     LibraryModule = false
     
     AssetCaching = "FlotsamAssetCache"
+	HypergridLinker         = "HypergridLinker"
 
 [SimulationDataStore]
     LocalServiceModule = "OpenSim.Services.Connectors.dll:SimulationDataService"

bin/config-include/StandaloneHypergrid.ini

@@ -22,6 +22,7 @@
     EntityTransferModule	= "HGEntityTransferModule"
     InventoryAccessModule	= "HGInventoryAccessModule"
     FriendsModule			= "HGFriendsModule"
+	HypergridLinker         = "HypergridLinker"
     
     InventoryServiceInConnector			= true
     AssetServiceInConnector				= true