make sure start and stop behave nicely

start.py

@@ -5,11 +5,14 @@ import wx
 
 from slic.gui.persist import Persistence
 
+from bstrd import bsstream
+
 from panel import MainPanel
 
 
 def run(*args, **kwargs):
     app = wx.App()
+    wx.Yield = app.Yield
     frame = MainFrame(*args, **kwargs)
     frame.Show()
     app.MainLoop()
@@ -43,8 +46,11 @@ class MainFrame(wx.Frame):
 
 
     def on_close(self, event):
+        print("bye")
+        bsstream.stop()
         self.persist.save()
         event.Skip() # forward the close event
+        wx.GetApp().Yield()