Rez new prims ON the ground, not halfway buried. Mantis 33.

OpenSim/Region/Environment/Scenes/Scene.cs

@@ -770,6 +770,12 @@ namespace OpenSim.Region.Environment.Scenes
                     //pos = new LLVector3(RezPoint.x, RezPoint.y, RezPoint.z);
 
                 }
+                else
+                {
+                    // rez ON the ground, not IN the ground
+                    pos.Z += 0.25F;
+                }
+
                 
                 SceneObjectGroup sceneOb =
                     new SceneObjectGroup(this, m_regionHandle, ownerID, PrimIDAllocate(), pos, rot, shape);