Major change: eyelink.awk uses a different time estimate

The time stamp in the eyelink *_eye.log files begins after the
calibration; but the video actually includes the calibration, which can
vary from 30 sec to 5 min. The result is total async in the gaze-video.

The solution is to use the first column in the _eye.log, which is the
time of log entry. It tracks the calibration time, etc. When we use this
as the time stamp, without any further adjustments, we can get close to
1sec or less.
mouse is now shown

changed made to better track and show the mouse location from the gaze
data. This is mostly useful for the eyelink data, but I am sure we can
use it later in the Tobii data, if we export from iohub again.

Good for checking the gaze-video asynchrony.