Change format of Track.__str__ and make sure it returns str, not unic…

…ode.

This fixes Unicode errors when running with --eventdebug.

xl/event.py

@@ -347,7 +347,7 @@ def _emit(self, event, exc_callbacks, emit_logmsg, emit_verbose):
                 logger.exception("Event callback exception caught!")
 
         if emit_logmsg:
-            logger.debug("Sent '%s' event from '%r' with data '%r'",
+            logger.debug("Sent '%s' event from %r with data %r",
                          event.type, event.object, event.data)
 
     def emit_async(self, event):

xl/trax/track.py

@@ -435,15 +435,8 @@ def __str__(self):
         """
             returns a string representing the track
         """
-        vals = map(self.get_tag_display, ('title', 'album', 'artist'))
-        rets = []
-        for v in vals:
-            if not v:
-                v = "Unknown"
-            v = "'" + v + "'"
-            rets.append(v)
-        ret = "%s from %s by %s" % tuple(rets)
-        return ret
+        vals = map(self.get_tag_display, ('title', 'artist', 'album'))
+        return "<Track %r by %r from %r>" % tuple(vals)
 
     def _pickles(self):
         """