* input/regression/newaddlyrics.ly: New file.

* input/regression/newaddlyrics.ly: New file.

* Documentation/topdocs/NEWS.texi: Update.

* lily/parser.yy (new_lyrics): Return SCM list of lyric musics.
(Music_list): Allow embedded scm.

* lily/score.cc (ly:score-bookify): New function.

* lily/music.cc (ly:music-scorify): Idem.

* lily/my-lily-parser.cc (ly:parser-print-book): Idem.
(ly:parser-print-score): Idem.

* scm/lily.scm (default-toplevel-book-handler): Idem.
(default-toplevel-music-handler): Idem.
(default-toplevel-score-handler): Idem.

* ly/declarations-init.ly: Set default toplevel handlers.

* lily/parser.yy (book_block, score_block, toplevel_music): Use them.

* scripts/lilypond-book.py (PREAMBLE_LY): Select classic score
printer for score at toplevel.