Some very rough notes attempting to document Subdiv_beta6,
Subtitle: Why is my solid not sub-dividable?

Thinking based upon solids referenced here: http://moi3d.com/forum/index.php?webtag=MOI&msg=7571.1
and here: http://moi3d.com/forum/index.php?webtag=MOI&msg=6674.349

- Brian