simple function to test calibration procedures
adopted from shorteyelinkdemo
uses our perfered resolution
John Palmer, last revised 6/6/01
5/29/01 Begun
6/4/01 using meyelinkinit2 due to revised arg in initwindow
6/6/01 updated for eyelinktoolbox 1.1, now uses initeyelinkdefaults
Psychtoolbox/PsychHardware/EyelinkToolbox/EyelinkTests/testcalib.m