Initial commit of untouched Exercise 2: Functions and Errors script.
Removed all errors in code.
Implemented a function to cut down on code repetition.
Added notes on code modularisation.
Initial commit of `stereoacuity.py`.
Set display units to degrees of visual angle, not pixels.
Used `copy` to allow for a central version of rds stimulus.
Broken dotStim generation.
Vaguely working - needs jittering.