* use correct left to right ordering in keySignature list

[hanwenn]

Reviewers: Reinhold,

Message:
Shouldn't there be changes in other files to correspond? (do we have a
regtest?)

Description:
* use correct left to right ordering in keySignature list
The keySignature property list of the KeySignature so far was using
reversed order (e.g. the rightmost accidental came first). This was
quite confusing when manually setting non-standard key signatures like
  \set Staff.keySignature = #`(((0 . 3) . ,SHARP)
                               ((0 . 5) . ,FLAT)
                               ((0 . 6) . ,FLAT))
In this example, you'll get bes, as, fis in that reversed order rather
than
in the order in which you list the alterations.

Please review this at http://codereview.appspot.com/8686

Affected files:
  M lily/key-engraver.cc


Index: lily/key-engraver.cc
diff --git a/lily/key-engraver.cc b/lily/key-engraver.cc
index  
d3b7eb01ddada1c2d00b7888fef88ee16ed88eb7..3f9dc02c1c9d40de7732bc2c569b7e65ec7ab73a  
100644
--- a/lily/key-engraver.cc
+++ b/lily/key-engraver.cc
@@ -93,13 +93,13 @@ Key_engraver::create_key (bool is_default)
                                         key_event_
                                         ? key_event_->self_scm () : SCM_EOL);
        
-             cancellation_->set_property ("alteration-alist", restore);
+	      cancellation_->set_property ("alteration-alist", scm_reverse  
(restore));
              cancellation_->set_property ("c0-position",
                                           get_property ("middleCPosition"));
            }
        }

-      item_->set_property ("alteration-alist", key);
+      item_->set_property ("alteration-alist", scm_reverse (key));
     }

   if (!is_default)
@@ -189,7 +189,7 @@ Key_engraver::read_event (Stream_event const *r)
        r->origin ()->warning ("No ordering for key signature alterations");
     }

-  context ()->set_property ("keySignature", accs);
+  context ()->set_property ("keySignature", scm_reverse (accs));
   context ()->set_property ("tonic",
                            r->get_property ("tonic"));
 }