Makes the parentheses-item::print function public. (issue4548056)

[mtsolo]

Reviewers: ,

Message:
This'll allow users to do some overrides on the parentheses stencil and
still call the print function at the end.

Description:
Makes the parentheses-item::print function public.

Please review this at http://codereview.appspot.com/4548056/

Affected files:
  M scm/output-lib.scm


Index: scm/output-lib.scm
diff --git a/scm/output-lib.scm b/scm/output-lib.scm
index  
27c69fdfbe82eba10f1d3dcc20fe8156863c0926..c25edf31f68a93de749a87e69e26cd4dde6dfc3d  
100644
--- a/scm/output-lib.scm
+++ b/scm/output-lib.scm
@@ -589,7 +589,7 @@ and duration-log @var{log}."
      (ly:stencil-translate-axis rp (+ (cdr x-ext) padding) X))))


-(define (parentheses-item::print me)
+(define-public (parentheses-item::print me)
   (let* ((elts (ly:grob-object me 'elements))
         (y-ref (ly:grob-common-refpoint-of-array me elts Y))
         (x-ref (ly:grob-common-refpoint-of-array me elts X))