Author: Andrew Nicols
MDL-56270 mod_book: Add next/prev chapter to attributes
This adds the details of the next/previous chapter to the image
attributes and link for the in-page chapter-to-chapter navigation.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=3cf1fea55ab2dada24b027627e1cc07a33c576b5
http://github.com/moodle/moodle/commit/3cf1fea55ab2dada24b027627e1cc07a33c576b5
+ 3.2 en [navprevtitle,mod_book]
+ 3.2 en [navnexttitle,mod_book]