* scripts/lilypond-book.py (Lilypond_file_snippet.my_system):

* scripts/lilypond-book.py (Lilypond_file_snippet.my_system):
write snippet-names binary.

* scripts/lilypond-book.py (bindir): use os.pathsep for prepending
to $PATH.

* scm/define-grobs.scm (all-grob-descriptions): use callback to
calc dot count.

* scm/output-lib.scm (string-number::calc-text): new function.
(note-head::calc-duration-log): new function.

* scm/output-lib.scm (fingering::calc-text): new function.