Add a JSON web fetch of the statististics managed by StatsManager.

Disabled by default. Enable by setting
[Startup]ManagedStatsRemoteFetchURI="Something"
and thereafter "http://ServerHTTPPort/Something/" will return all the managed
stats (equivilent to "show stats all" console command).
Accepts queries "cat=", "cont=" and "stat=" to specify statistic category,
container and statistic names. The special name "all" is the default and returns
all values in that group.

OpenSim/Region/Application/OpenSimBase.cs

@@ -75,6 +75,7 @@ namespace OpenSim
         protected int proxyOffset = 0;
         
         public string userStatsURI = String.Empty;
+        public string managedStatsURI = String.Empty;
 
         protected bool m_autoCreateClientStack = true;
 
@@ -188,6 +189,7 @@ namespace OpenSim
                     CreatePIDFile(pidFile);
                 
                 userStatsURI = startupConfig.GetString("Stats_URI", String.Empty);
+                managedStatsURI = startupConfig.GetString("ManagedStatsRemoteFetchURI", String.Empty);
             }
 
             // Load the simulation data service