argsparser.py: Removes __init__() doctest
external.py: Adds CLIArgs() test to test suite
external.py: Alphabetizes test functions
utils.py: Removes path() function doctest
external.py: Adds PathUtil() test to test suite
dbbase.py: Removes read(), write(), list(), and select() doctests
external.py: Adds ReadWriteSelectListDbBase() test to test suite
overlay.py: Removes get_infostr(), short_list(), and __init__() doctests
external.py: Adds OverlayObjTest() test to test suite