* scripts/lilypond-latex.py (run_dvips): remove -bin everywhere.

* scripts/lilypond-latex.py (run_dvips): remove -bin everywhere.

* lily/GNUmakefile (NAME): create lilypond, not lilypond-bin

* scripts/lilypond-latex.py: move from lilypond.py

* make/lilypond-vars.make: centralize LILYPOND_BOOK_FLAGS setting.
(LILYPOND_BOOK_FLAGS): use -f tex for lilypond-book.

* lily/paper-book.cc (post_processing): call
convert-to-{dvi,ps,png,pdf}

* lily/paper-book.cc (output): call output-preview-framework
(post_processing): new function. Do PDF/PNG conversion.

* scm/framework-ps.scm (convert-to-pdf): new function. Call
ps2pdf.
(output-preview-framework): new function. Generate a preview .ps