final version before pilot testing
switching branches to run calibration on master, no significant changes to commit
Experiment file: increased presentation time, reduce number of repetitions and number of trials per session
Load textures file: changed fixation to an E letter. The orientation of the E is chosen randomly.
TODO: add a KbCheck loop to display stimulus only if response to E is correct, otherwise display new fixation
Merge branch 'template' into MarinaOcclusions
Discarded old conflicting scell code, added new giant matrix code

Conflicts:
	BF_test_params/exp_marina_occlusions.m
TESTED AND WORKING ON BF DISPLAY
Fixed minor bug which did not record stim dur.