Removing our CalStruct code that was committed on June 10.  This breaks in Octave, so we're not putting it in PTB.  Those wishing to take advantage of the new code can get it from the BrainardLabToolbox (under DavidBrainard in gitHub) -- just put this in front of PTB on your path and the new code will override PTB's standard functions.

Did this by grabbing code from the commit right before we did this and putting back the old PsychCal, plus the old CalDemo into the PsychDemos folder.

Still need to figure out what was changed in IsomerizationsInEyeDemo by Mario, to decide how to put that back.

Signed-off-by: David Brainard <brainard@psych.upenn.edu>
Add conditional on calibration code running so this will work in Brainard Lab but also elsewhere.A

Signed-off-by: David Brainard <brainard@psych.upenn.edu>