Remove spaces at EOL
Replaced get_datetime_obj() with time.strptime() and datetime.datetime()
Lift out read_config(), check_dirs() and collect() from Account()
Refactor SimpleConfig()
Lift out rotate_new_arrivals() from Account
Account() and Backup() are now new style classes
Simpler __init__() in Account
Removed some code duplication. rotate_(hourlies|dailies|weeklies)()

rotate_hourlies(), rotate_dailies() and rotate_weeklies() have been
replaced by a generic rotate() and helped by a new function
is_rotation_time()
Default settings are now more generic and consistent with documatation