WARNING: BREAKING CHANGES FOR REGION MODULE DEVELOPMENT.

This cleans up Opensim's use of mono addins. In particular, the extension points /OpenSim/RegionModules and /OpenSim/WindModule moved from OpenSim.exe to OpenSim.Region.Framework.dll. From here on, developers of region modules should declare their dlls to be dependent on OpenSim.Region.Framework, starting with version 0.8.1
Additional changes:
- Addins version uniformly updated to 0.8.1. These numbers should be compatible with the release numbers or else it becomes very confusing.
- Mono addins directives moved from files addins.xml to embedded directives in the class and assembly declarations, to make it all consistent

OpenSim/Region/Framework/Interfaces/IRegionModuleBase.cs

@@ -32,6 +32,7 @@ using OpenSim.Region.Framework.Scenes;
 
 namespace OpenSim.Region.Framework.Interfaces
 {
+    [TypeExtensionPoint(Path = "/OpenSim/RegionModules", NodeName="RegionModule")]
     public interface IRegionModuleBase
     {
         /// <value>

OpenSim/Region/Framework/Interfaces/IWindModelPlugin.cs

@@ -33,8 +33,11 @@ using OpenSim.Framework;
 using OpenMetaverse;
 using OpenSim.Region.Framework.Scenes;
 
+using Mono.Addins;
+
 namespace OpenSim.Region.Framework.Interfaces
 {
+    [TypeExtensionPoint(Path = "/OpenSim/WindModule", NodeName = "WindModel")]
     public interface IWindModelPlugin : IPlugin
     {
         /// <summary>

OpenSim/Region/Framework/Properties/AssemblyInfo.cs

@@ -1,6 +1,7 @@
 using System.Reflection;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
+using Mono.Addins;
 
 // General Information about an assembly is controlled through the following 
 // set of attributes. Change these attribute values to modify the information
@@ -22,6 +23,7 @@ using System.Runtime.InteropServices;
 // The following GUID is for the ID of the typelib if this project is exposed to COM
 [assembly: Guid("d25e7aed-7f55-4bb8-9970-0d7d978ea8a5")]
 
+
 // Version information for an assembly consists of the following four values:
 //
 //      Major Version
@@ -30,4 +32,5 @@ using System.Runtime.InteropServices;
 //      Revision
 //
 [assembly: AssemblyVersion("0.8.1.*")]
+[assembly: AddinRoot("OpenSim.Region.Framework", "0.8.1")]