Add ILandChannel.GetLandObject(Vector3 position) as this is a very common input to GetLandObject()

This conforms to the existing ILandChannel.ParcelsNearPoint() method

OpenSim/Framework/ILandChannel.cs

@@ -55,6 +55,13 @@ namespace OpenSim.Region.Framework.Interfaces
         /// <returns>Land object at the point supplied</returns>
         ILandObject GetLandObject(float x, float y);
 
+        /// <summary>
+        /// Get the parcel at the specified point
+        /// </summary>
+        /// <param name="position">Vector where x and y components are between 0 and 256.  z component is ignored.</param>
+        /// <returns>Land object at the point supplied</returns>
+        ILandObject GetLandObject(Vector3 position);
+
         /// <summary>
         /// Get the parcels near the specified point
         /// </summary>

OpenSim/Region/CoreModules/World/Land/LandChannel.cs

@@ -95,6 +95,11 @@ namespace OpenSim.Region.CoreModules.World.Land
             return null;
         }
 
+        public ILandObject GetLandObject(Vector3 position)
+        {
+            return GetLandObject(position.X, position.Y);
+        }
+
         public ILandObject GetLandObject(int x, int y)
         {
             if (m_landManagementModule != null)

OpenSim/Region/RegionCombinerModule/RegionCombinerLargeLandChannel.cs

@@ -68,6 +68,11 @@ public class RegionCombinerLargeLandChannel : ILandChannel
             RootRegionLandChannel.Clear(setupDefaultParcel);
         }
 
+        public ILandObject GetLandObject(Vector3 position)
+        {
+            return GetLandObject(position.X, position.Y);
+        }
+
         public ILandObject GetLandObject(int x, int y)
         {
             //m_log.DebugFormat("[BIGLANDTESTINT]: <{0},{1}>", x, y);

OpenSim/Tests/Common/Mock/TestLandChannel.cs

@@ -81,6 +81,11 @@ namespace OpenSim.Tests.Common.Mock
             return obj;
         }
 
+        public ILandObject GetLandObject(Vector3 position)
+        {
+            return GetLandObject(position.X, position.Y);
+        }
+
         public ILandObject GetLandObject(int x, int y)
         {
             return GetNoLand();