fix for eyelink calibration monitor selection.
Merge pull request #359 from isolver/master

GF: fix for eyelink calibration monitor selection.
BF: fix for binoc eye getPosition() bug.
Merge pull request #361 from isolver/master

BF: fix for smi binoc eye getPosition() bug.
BF: fixed buglet with StairHandler - first reversal was in the wrong place

(just first reversal, so no actual effect on derived thresholds)