* Removes the hard-coded 'book' type and perform all node actions
equally on any node type via hook_nodeapi.
* Achieves 100% integration with the menu system. Improves
performance of book rendering.
* All the algorithms have been changed to use the tree data structure
returned by the menu system.
* Added support for 'multiple books'.
* Some UI improvements.
This is a momumental patch that took 69 iterations. Although there is
room for improvement, this is a big step forward. Thanks for the
persistence, pwolanin.
Dries Buytaert