SH-1744 Add havok's degenerate triangle check to importer.  Highlight degenerate triangles in physics mesh and block upload when degenerate triangles are present.

fix for SH-1691: [crashhunters] crash at LLVolumeImplFlexible::doFlexibleUpdate() [secondlife-bin llflexibleobject.cpp]

Unused local varible removed.

SH-1682 Use GL_ARB_map_buffer_range to mitigate impact of mapping larger vertex buffer objects.  Limit number of textures per batch to 6 (prevents frame stalls on NVIDIA).

SH-1682 Dynamically adjust the number of texture channels to use for indexed texture rendering based on available hardware.

no idea how this ever worked before, as the code since 1.23 has been using the wrong keyword ("everyone_mask" instead of "new_everyone_mask").  I suspect something changed on the sim side?

SH-1359 General octree tune-up -- increase maximum capacity of an octree node and rework requested octree node sizes for minimum triangles per frame and maximum triangles per drawing call.