Implemented new staircase method
Additional features include: blocking, save/reload, new display messages
Data analysis code has not been updated
Code has NOT been tested on BF Display computer
This code is tested on the BF Display.
It was working, but now there is a weird bug
where it doesn't start. Also the break message
is too short.
Changed staircases to [2 1] [1 2]
Merge branch 'staircase'

Conflicts:
	BF_build_textures_optimizer.m (IPD)
	BF_test_params/exp_hinge.m (rewrite)