Another interregion comms change that will not work well with previous versions. This commit moves InformRegionOfChildAgent from OGS1 to RESTComms, effectively having the complete child agent life cycle over REST: create=POST, update=PUT, close=DELETE.

Additional changes include more functions in the IHyperlink interface, and some refactorings in the HG code for better reuse in RESTComms.

OpenSim/Region/Environment/Interfaces/IInterregionComms.cs

@@ -35,6 +35,8 @@ namespace OpenSim.Region.Environment.Interfaces
 
     public interface IInterregionCommsOut 
     {
+        bool SendCreateChildAgent(ulong regionHandle, AgentCircuitData aCircuit);
+
         /// <summary>
         /// Full child agent update.
         /// </summary>