add inclusion comments+discussion

I did this when I was refactoring the inclusion expansion for the new layout system and forgot to mention it.  -e


Seems fine. http://test.dwagn.org/wagn/blank Rather idiosyncratic, but i can't think (in 30 seconds of pondering) of another way to do it that's better. Closed and documented (on nesting).

  --John Abbe.....Sat Dec 05 16:55:10 -0800 2009