Author: Petr Skoda
book should be now compatible with 1.8
http://git.moodle.org/gw?p=moodle.git;a=commit;h=dab784a34e1ee68def000a21bdce13477a3495ef
http://github.com/moodle/moodle/commit/dab784a34e1ee68def000a21bdce13477a3495ef
+ 2.3 en [doexport,book]