Add method doc to T015_LargeSceneObjects() and slightly clean up formatting.

This test takes a considerable time on SQLite but should remain since it's testing storage and retrieval of a scene object with 31 parts.

OpenSim/Data/Tests/RegionTests.cs

@@ -534,6 +534,9 @@ namespace OpenSim.Data.Tests
             Assert.That(scale,Is.EqualTo(p.Scale), "Assert.That(scale,Is.EqualTo(p.Scale))");
         }
                 
+        /// <summary>
+        /// Test storage and retrieval of a scene object with a large number of parts.
+        /// </summary>
         [Test]
         public void T015_LargeSceneObjects()
         {