Standardize format of `in_color`

lily/tie.cc

 /*
   This file is part of LilyPond, the GNU music typesetter.
 
   Copyright (C) 1997--2015 Han-Wen Nienhuys <hanwen@xs4all.nl>
 
   LilyPond is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.
 
@@ skipping 263 matching lines @@
   if (scm_is_string (annotation))
     {
       string str;
       SCM properties = Font_interface::text_font_alist_chain (me);
 
       Stencil tm = *unsmob<Stencil> (Text_interface::interpret_markup
                                     (me->layout ()->self_scm (), properties,
                                      annotation));
       tm.translate (Offset (b.control_[3][X_AXIS] + 0.5,
                             b.control_[0][Y_AXIS] * 2));
-      tm = tm.in_color (1, 0, 0);
+      tm = tm.in_color (1.0, 0.0, 0.0);
 
       /*
         It would be nice if we could put this in a different layer,
         but alas, this must be done with a Tie override.
       */
       a.add_stencil (tm);
     }
 #endif
 
   return a.smobbed_copy ();
@@ skipping 102 matching lines @@
                "control-points "
                "dash-definition "
                "details "
                "direction "
                "head-direction "
                "line-thickness "
                "neutral-direction "
                "staff-position "
                "thickness "
               );