added command line option to write trace to file
only run for 5 seconds
append to trace file if it exists when we're redirecting output to file
require manual to be free in find-black-target so it doesn't find the target it's about to click on
made defaults for screen and button size better
use default values when unspecified in run-trials
fixed name of default value for real time
move button by realistic amount
do incremental mouse moves
removed debug output