ati_remote causes repeats after only .23 seconds with my remote and
makes it hard to use comfortably. Make a precise way of setting the
repeat delay time in milliseconds and default it to 500ms.  The old
behavior can be had by setting repeat_delay = 0.
Signed-off-by: NKarl Pickett <karl.pickett@gmail.com>
Signed-off-by: NVincent Vanackere <vincent.vanackere@gmail.com>
Signed-off-by: NDmitry Torokhov <dtor@mail.ru>