Added the staircase plot back to noise con to better keep track of
what’s happening over time during learning.

Changed base SnR rates slightly so that they are equal distance on a
semi-log plot.
removed “task.thisblock” and moved curBlock into stimulus.
Added code that saves time by only generating non-target images once
per run.
Added code to clear the screen at the end of the experiment.
Tried to fix the colors of the text, was not successful.
Increased initial stepwise to 1/3 threshold.
Blocked thresholds from going to 0 (min .01 and .001 gender/noisecon
respectively).
Fixed some legacy code issues in stimulus.pedestals