[development] a more flexible book module

[Peter Wolanin]

I wrote the list before about proposed changes to the book module
(http://drupal.org/node/65319).  In response to comments a number of
developers and book module users, I've posted a new issue and am
trying to take this the last steps before the freeze:

http://drupal.org/node/81226

I would deeply appreciate your (public or private) comments on both
the code and the concept.