* Documentation/user/changing-defaults.itely (Creating contexts):

* Documentation/user/changing-defaults.itely (Creating contexts):
index entries

* scm/page-breaking.scm (ly:optimal-page-breaks): new
file. Rewrite function.

* lily/paper-book.cc (pages): new interface: page-breaking returns
list of line-list.

* lily/page.cc (Page): take lines argument.

* scm/document-translation.scm (all-engravers-doc): link to user man

* scm/page-layout.scm (ly:optimal-page-breaks): use penalty iso. score.

* Documentation/user/notation.itely (Relative octaves): typo.

* lily/paper-book.cc (LY_DEFINE): ly:output-formats. New function.