Implemented user management. The bot now initializes and maintains a list
of User objects, a list of usernames who are ops. Moved the User class
inside the Bot class. I still need to add the broadcaster to the list of admins. (Reimplement Bot.User.checkIfAdmin(). Users/usernames can be added and removed to the bot as needed.

Logging to system, IRC, and chat logs is implemented and working using the
LogFairy.XMessage classes and LogFairy.writeToXLog() methods.I also want
to implement a fourth log file to manage timeouts and bans. I have started
implementing a bit mask for system logging to limit what is logged.

The unit tests have been updated to use a test bitmask. In prod, this will
be supplied as an int.

All code and config files have been modified to use NIX notation for
directory paths.

Housekeeping, comments, etc. for all new code and fixed/updated old
comments. I updated the TODO list inside of pyayabot_main.py as well as
the TODO file.
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