add some rarely used mensural clefs (issue 330120043 by address@hidden)

[benko . pal]

Reviewers: ,

Message:
g1 clef occurs in English manuscripts;
f2 clef occurs in Ockeghem's Missa prolationum (Chigi codex)

Description:
add some rarely used mensural clefs
and an alias petrucci-g2 to petrucci-g

Please review this at https://codereview.appspot.com/330120043/

Affected files (+9, -0 lines):
  M scm/parser-clef.scm


Index: scm/parser-clef.scm
diff --git a/scm/parser-clef.scm b/scm/parser-clef.scm
index  
ea9f67fade20959cfb49300c21e52aba51770d2b..9832753445166c55b0dc1986c60db29b39d039ad  
100644
--- a/scm/parser-clef.scm
+++ b/scm/parser-clef.scm
@@ -87,10 +87,13 @@
     ("petrucci-c3" . ("clefs.petrucci.c3" 0 0))
     ("petrucci-c4" . ("clefs.petrucci.c4" 2 0))
     ("petrucci-c5" . ("clefs.petrucci.c5" 4 0))
+    ("petrucci-f2" . ("clefs.petrucci.f" -2 0))
     ("petrucci-f3" . ("clefs.petrucci.f" 0 0))
     ("petrucci-f4" . ("clefs.petrucci.f" 2 0))
     ("petrucci-f5" . ("clefs.petrucci.f" 4 0))
     ("petrucci-f" . ("clefs.petrucci.f" 2 0))
+    ("petrucci-g1" . ("clefs.petrucci.g" -4 0))
+    ("petrucci-g2" . ("clefs.petrucci.g" -2 0))
     ("petrucci-g" . ("clefs.petrucci.g" -2 0))
     ("kievan-do" . ("clefs.kievan.do" 0 0))))

@@ -123,7 +126,13 @@
     ("clefs.petrucci.c3" . 0)
     ("clefs.petrucci.c4" . 0)
     ("clefs.petrucci.c5" . 0)
+    ("clefs.petrucci.f2" . 4)
+    ("clefs.petrucci.f3" . 4)
+    ("clefs.petrucci.f4" . 4)
+    ("clefs.petrucci.f5" . 4)
     ("clefs.petrucci.f" . 4)
+    ("clefs.petrucci.g1" . -4)
+    ("clefs.petrucci.g2" . -4)
     ("clefs.petrucci.g" . -4)
     ("clefs.kievan.do" . 0)))