* lily/kpath.cc:

* lily/kpath.cc:
* lily/pdf.cc (Pdf_file): Use more generic error messages.

* scm/lily-library.scm (version-not-seen-message): New function.
* ly/init.ly: Use it.

* scm/page-layout.scm (ly:optimal-page-breaks): Display page
breaks as progess.

* scripts/lilypond-book.py (do_process_cmd): Do not lump
whitespace with l10n message.

* scm/framework-tex.scm (convert-to-ps):
(convert-to-dvi): Do not use overly specific l10n messages.

* ly/titling-init.ly (bookTitleMarkup): Add baseline skips from 2.4.