streamlinging/starting fresh on analysis

removed outdated analysis script to start anew
removed evtsplit; this repo now depends on electrophysiology repo
added utilities to streamline analysis

cleanseries moved to utils
us2secs converts tobii timestamps to doubles in seconds
basenorm baseline normalizes
added code to analyze darktest
added lighttest analysis code
added code to analyze reversal learning
added oddball analysis code
added pst analysis code