Initialize eyelink defaults and control code structure
USAGE: el=
EyelinkInitDefaults([window])
window is optional windowPtr.
If set, pixel coordinates are send to eyetracker
and fill it with some sensible values.
Note that these values are only used by the m-file
versions of dotrackersetup and dodriftcorrect.
Psychtoolbox/PsychHardware/EyelinkToolbox/EyelinkBasic/EyelinkInitDefaults.m