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

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

* lily/dots-engraver.cc (class Dots_engraver): new engraver:
handle dot creation separately.

* lily/tab-note-heads-engraver.cc (process_music): idem.

* lily/drum-note-engraver.cc (process_music): idem.

* lily/note-heads-engraver.cc (process_music): idem.

* lily/rest-engraver.cc: don't set duration-log.

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

* lily/fingering-engraver.cc (make_script): remove 'text setting.

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