BulletSim: remove degenerate triangles from meshes. This fixes the

invisible barriers in sculptie doorways (Mantis 6529).
Bump up level-of-detail for physical meshes to 32 (the max). This
fixes the invisible barriers that showed up in prim cut arches.
NOTE: the default LOD values are removed from OpenSimDefaults.ini.
   If you don't change your OpenSimDefaults.ini, you will continue
   to see the arch problem.

OpenSim/Region/Physics/Manager/IMesher.cs

@@ -59,6 +59,7 @@ namespace OpenSim.Region.Physics.Manager
         List<Vector3> getVertexList();
         int[] getIndexListAsInt();
         int[] getIndexListAsIntLocked();
+        float[] getVertexListAsFloat();
         float[] getVertexListAsFloatLocked();
         void getIndexListAsPtrToIntArray(out IntPtr indices, out int triStride, out int indexCount);
         void getVertexListAsPtrToFloatArray(out IntPtr vertexList, out int vertexStride, out int vertexCount);