Please describe the problem:
Devices are not unregistering properly thus persistence is lost from settings

Steps to reproduce:
1. More than one input or output device must be registered.
2. Pull up settings dialog and change settings for a device.  FestivalSpeech is first device so problem won't show up for it.
3. Quit LSR.
4.  Start LSR and see if settings persisted.


Actual results:
The settings for the device will not persist

Expected results:
The settings should persist through multiple runs of LSR.

Does this happen every time?
Yes, this happens everytime.

Other information:
The problem is in DeviceManager.py.  The close method iterates through both the input and output devices and calls unRegisterDevice for each.  unRegisterDevice removes the device from the list which corrupts iterator in the close method.  The solution is to make a copy of the list ie.  for d in self.out_devs[:]: for both output and input loops.  The unRegisterDevice may be best broken into two methods unRegisterOutputDevice and unRegisterInputDevice.  Also, the unloadDevices method is not being called.  It may be a candidate for removal.