Set QTimer to 1ms in attempt to fix update isses.

Can you give this a try and see if you see *any* difference at all?

On my end, modifying QTimer to 1ms and fb_viewer.py with sleep(1), was running ~20fps, with reasonable image update, no crashes, etc.

I think this means my code wasn't polling often enough; when fb_lock() failed (return 0), it'd wait forever before trying again. According to what I saw dumping usb traffic, fb_lock() fairly rarely succeeds so the qt4-ide would hardly ever get an image to update.

Incidentally it appears this branch originated from the earlier qtide branch. My bad.