* scm/define-grobs.scm (all-grob-descriptions): remove

* scm/define-grobs.scm (all-grob-descriptions): remove
enclose-bounds in OttavaBracket and PianoPedalBracket

* scm/new-markup.scm (def-markup-command) new macro, which takes
care of defining the COMMAND-markup and make-COMMAND-markup
procedures, setting markup-signature and keyword-signature object
properties, and pushing the markup command in
markup-function-list.

* scm/new-markup.scm:Little scheme style clean-up: there should be
no parenthese alone on a line; LET* should not be used where LET
is enough. (Nicolas Sceaux)