USAGE: result=
EyelinkDoTrackerSetup(el [, sendkey])
el: Eyelink default values
sendkey: set to go directly into a particular mode
'v', start validation
'c', start calibration
'd', start driftcorrection
13, or el.ENTER_KEY, show 'eye' setup image
Psychtoolbox/PsychHardware/EyelinkToolbox/EyelinkBasic/EyelinkDoTrackerSetup.m