For monitoring purposes, start non-timeout tasks (which do not currently use a threadpool) via Watchdog.RunInThread() rather than Util.RunThreadNoTimeout()

The functionality is the same but this allow us to monitor such tasks via "show threads" and abort them for test purposes, etc.
Also extends thread names to provide more info (e.g. SendInitialDataToClient says what client the task is for).

OpenSim/Addons/Groups/Hypergrid/GroupsServiceHGConnectorModule.cs

@@ -32,6 +32,7 @@ using System.Reflection;
 using System.Text;
 
 using OpenSim.Framework;
+using OpenSim.Framework.Monitoring;
 using OpenSim.Framework.Servers;
 using OpenSim.Region.Framework.Scenes;
 using OpenSim.Region.Framework.Interfaces;
@@ -560,7 +561,7 @@ namespace OpenSim.Groups
 
                     // so we have the list of urls to send the notice to
                     // this may take a long time...
-                    Util.RunThreadNoTimeout(delegate
+                    Watchdog.RunInThread(delegate
                     {
                         foreach (string u in urls)
                         {
@@ -571,7 +572,7 @@ namespace OpenSim.Groups
                                     hasAttachment, attType, attName, attItemID, AgentUUIForOutside(attOwnerID));
                             }
                         }
-                    }, "AddGroupNotice", null);
+                    }, string.Format("AddGroupNotice (agent {0}, group {1})", RequestingAgentID, groupID) , null);
 
                     return true;
                 }