This commit was originally from @fredfishgames, but it
needed a big rebase due to use letting it sit too long.
Also, we decided not to have shebangs at the top of test
files.
Before this change, we were looking for config files in
default locations in source control, which is not a good
place to look for them. Now `run.py` and friends have a
command line argument where users can specify the config
files.
Note that the change to server.py is only a partial fix
to make it so that bots that don't use third party config
files won't crash. That program needs an overhaul, anyway.
Before this commit, you would get a traceback if you supplied
a non-existent filename for your config file. Now we exit
gracefully with a useful error message.
