Send group notices through the same messaging module mechanism used to send group chat to avoid timeout issues when sending messages to large groups.

Only implementing for XmlRpcGroups initially to test.
May require MessageOnlineUsersOnly = true in [Groups] to be effective.
In relation to http://opensimulator.org/mantis/view.php?id=7037

OpenSim/Addons/Groups/GroupsModule.cs

@@ -45,9 +45,6 @@ namespace OpenSim.Groups
     [Extension(Path = "/OpenSim/RegionModules", NodeName = "RegionModule", Id = "GroupsModule")]
     public class GroupsModule : ISharedRegionModule, IGroupsModule
     {
-        /// <summary>
-        /// </summary>
-
         private static readonly ILog m_log =
             LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
 
@@ -466,6 +463,7 @@ namespace OpenSim.Groups
                             OnNewGroupNotice(GroupID, NoticeID);
                         }
 
+                       
                         // Send notice out to everyone that wants notices
                         foreach (GroupMembersData member in m_groupData.GetGroupMembers(GetRequestingAgentIDStr(remoteClient), GroupID))
                         {