* lily/stencil-scheme.cc (ly:stencil-expr): Rename (was:

* lily/stencil-scheme.cc (ly:stencil-expr): Rename (was:
ly:stencil-get-expr).  Update callers.
(ly:stencil-align-to!):  Return stencil too.

* lily/paper-outputter.cc (output_page): Bugfix.  Use page
stencil.  Remove looped line-based page output.
(output_line): Use line stencil.  Remove looped stencil-based line
output.

* lily/page.cc (ly:page-paper-lines): New function.

* input/test/markup-score.ly: New file.

* lily/book.cc (to_stencil): New method.

* lily/parser.yy (markup): Use it to grok \score.