fixed a bug where sometimes chrY folder will not exist and program
returns error when creating the fullpath.
get_all_fnames() fixed for a Try/Except combo for trying to build
fullpaths. sometimes chrY does not exist as a folder because no
annotations.
moved try/except combo to os.listdir() command rather than path.join()
command, since that is useless in catching exceptions.
added a print statement of how many t-tests were done.