* lily/paper-outputter.cc (output_expr):

* lily/paper-outputter.cc (output_expr):
(output_header):
(output_line): New method.

* lily/system.cc (get_line):
(get_lines): New method.
(output_scheme):
(output_line): Remove.

* scm/lily.scm (make-title): New function.

* lily/paper-book.cc:
* lily/include/paper-book.hh: New file.

* lily/include/ly-module.hh: New file, matching ly-module.cc (WAS:
ly-modules.hh).

* lily/ly-module.cc (ly_modules_lookup): New function.

* lily/main.cc (main_with_guile): Move memory leak debug code back.

* scm/output-ps.scm (make-title): Remove.
(output-scopes): Junk header-title test.