* lily/include/slur-scoring.hh (struct Slur_score_state): new file

* lily/include/slur-scoring.hh (struct Slur_score_state): new file

* lily/include/slur-configuration.hh (class Slur_configuration):
new file.

* lily/slur-configuration.cc: new file. move scoring functions
into Slur_configuration.

* lily/slur-scoring.cc (Slur_score_state): change static functions
to methods of Slur_score_state.

* lily/bezier-bow.cc (Message):

* flower/include/interval-set.hh (Message): new file.

* flower/interval-set.cc (Message): new file.