* lily/relocate.cc (prefix_relocation): allow "current"

* lily/relocate.cc (prefix_relocation): allow "current"
iso. TOPLEVEL_VERSION for share/lilypond/ suffix. This makes
changing VERSION in a lily tree less painful.

* input/regression/parenthesize.ly: new file.

* scm/output-lib.scm (parenthesize-element): new function.

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

* lily/accidental-engraver.cc (make_standard_accidental): reroute
cause: accidentals are caused by note heads, not note events.