Bracket_nesting_node): new class.
(struct Bracket_nesting_group): new class
(struct Bracket_nesting_staff): new class.
(process_music): create hierarchy of grobs. This allows separate
tuning of different SSDs.
ADD_TRANSLATOR (Nested_system_start_delimiter_engraver,
/* doc */ "Creates a system start delimiter (ie. SystemStart@{Bar, Brace, Bracket@} spanner",
- /* create */ "NestedSystemStartDelimiter",
+ /* create */ "SystemStartSquare SystemStartBrace SystemStartBracket SystemStartBar",
/* accept */ "",
/* read */ "systemStartDelimiterHierarchy",
/* write */ "");