* scm/lily.scm (postscript->pdf): Remove .pdf file if it

* scm/lily.scm (postscript->pdf): Remove .pdf file if it
exists before converting.

* scm/framework-tex.scm (convert-to-dvi): Remove .dvi file if it
exists before converting.
(convert-to-ps): Remove .ps file if it exists before converting.

* lily/lexer.ll: Remove extra progress newline, use present tense.

* scm/paper.scm (paper-alist): public.
* scm/framework-tex.scm (convert-to-ps):
* scm/lily.scm (postscript->pdf): Do not leak papersizename into
command line.  (backportme)