* scm/music-functions.scm (def-grace-function): move macros from

* scm/music-functions.scm (def-grace-function): move macros from
ly/music-functions-init.ly

* lily/paper-outputter.cc (Paper_outputter): move scheme_calls to
framework-tex.scm

* scm/framework-tex.scm (dump-line): new file. High level
interface for output (pages, systems, header).

* lily/include/page.hh (class Page): add is_last_ field.

* lily/paper-outputter.cc (print_smob): smobify Paper_outputter.

* lily/paper-book.cc (split_string): new function
(output): output multiple formats, i.e. --format=ps,tex

* lily/paper-outputter.cc (Paper_outputter): take format argument.