Improve "j2k decode" command to tell us how many layers and components were decoded, instead of just success/failure

OpenSim/Region/Framework/Interfaces/IJ2KDecoder.cs

@@ -43,5 +43,15 @@ namespace OpenSim.Region.Framework.Interfaces
         /// <param name="j2kData"></param>
         /// <returns>true if decode was successful.  false otherwise.</returns>
         bool Decode(UUID assetID, byte[] j2kData);
+
+        /// <summary>
+        /// Provides a synchronous decode so that caller can be assured that this executes before the next line
+        /// </summary>
+        /// <param name="assetID"></param>
+        /// <param name="j2kData"></param>
+        /// <param name="layers">layer data</param>
+        /// <param name="components">number of components</param>
+        /// <returns>true if decode was successful.  false otherwise.</returns>
+        bool Decode(UUID assetID, byte[] j2kData, out OpenJPEG.J2KLayerInfo[] layers, out int components);
     }
 }