Added 250000 baud for marlin compatibility

pronterface.py

@@ -379,7 +379,7 @@ class PronterWindow(wx.Frame,pronsole.pronsole):
         uts.Add(self.serialport)
         uts.Add(wx.StaticText(self.panel,-1,"@",pos=(250,5)),wx.RIGHT,5)
         self.baud = wx.ComboBox(self.panel, -1,
-                choices=["2400", "9600", "19200", "38400", "57600", "115200"],
+                choices=["2400", "9600", "19200", "38400", "57600", "115200", "250000"],
                 style=wx.CB_DROPDOWN|wx.CB_SORT|wx.CB_READONLY, size=(110,30),pos=(275,0))
         try:
             self.baud.SetValue("115200")