* scm/paper.scm (set-staff-size): new function: set default

* scm/paper.scm (set-staff-size): new function: set default
staff-size.

* scm/paper.scm: new file.
(set-staff-size): new function
(set-paper-size): new function

* Documentation/user/refman.itely (Fermatas): document \lyricsto