adding test mode

testMode is now a commandline parameter; default is F, or false. If T,
we will disable INFO and DEBUG output. Good for testing AOI matching and
video-gaze time lags.
change logFileSuffix to datalogFileSuffix

to accommodate outputLogFileSuffix in a later version
add outputLogFileSuffix parameter in YAML and commandline

now we can set the name of the output file
outputLogFileSuffix = _mouse.log