Random stimulus presentation works - still need to fix plotting
Added doShortCatchTrial - UNTESTED!
Edits to doShortCatchTrial
plotting edit
Short catch trial now works - but plotting still not right - LG
backward compatibility for plotFlashingStim for doShortCatchTrial
doShortCatchTrial - better but odds still not working - LG
edits to change odds to doShortCatchTrial
doShortCatchTrial now works - LG
FrameRand pres and plotting fixes

Signed-off-by: Lindsey <glickfeld@neuro.duke.edu>
edits to counting frames off

Signed-off-by: Lindsey <glickfeld@neuro.duke.edu>