check in an OSUUID wrapper as potential replacement

for LLUUID in most of our code.  Like LLUUID, this is
basically just a box type on the .NET Guid.

OpenSim/Framework/OSUUID.cs

@@ -0,0 +1,85 @@
+// OSUUID.cs created with MonoDevelop
+// User: sdague at 10:17 AM 4/9/2008
+//
+// To change standard headers go to Edit->Preferences->Coding->Standard Headers
+//
+
+using System;
+using libsecondlife;
+
+namespace OpenSim.Framework
+{
+    [Serializable]
+    public struct OSUUID: IComparable
+    {
+        public Guid UUID;
+	
+        /* Constructors */
+        public OSUUID(string s)
+        {
+            if (s == null)
+                UUID = new Guid();
+            else
+                UUID = new Guid(s);
+        }
+
+        public OSUUID(Guid g)
+        {
+            UUID = g;
+        }
+
+        public OSUUID(LLUUID l)
+        {
+            UUID = l.UUID;
+        }
+
+        public OSUUID(ulong u)
+        {
+            UUID = new Guid(0, 0, 0, BitConverter.GetBytes(u));
+        }
+
+        // out conversion
+        public string ToString()
+        {
+            return UUID.ToString();
+        }
+
+        public LLUUID ToLLUUID()
+        {
+            return new LLUUID(UUID);
+        }
+
+        // for comparison bits
+        public override int GetHashCode()
+        {
+            return UUID.GetHashCode();
+        }
+
+        public override bool Equals(object o)
+        {
+            if (!(o is LLUUID)) return false;
+            
+            OSUUID uuid = (OSUUID)o;
+            return UUID == uuid.UUID;
+        }
+
+        public int CompareTo(object obj)
+        {
+            if (obj is OSUUID)
+            {
+                OSUUID ID = (OSUUID)obj;
+                return this.UUID.CompareTo(ID.UUID);
+            }
+
+            throw new ArgumentException("object is not a OSUUID");
+        }
+
+        // Static methods
+        public static OSUUID Random()
+        {
+            return new OSUUID(Guid.NewGuid());
+        }
+
+        public static readonly OSUUID Zero = new OSUUID();
+    }
+}