Sane default behavior when rwfus is installed

[ValShaped]

Running rwfus without any parameters will currently attempt to install rwfus again. This is great for a first install, but it may be undesired behavior if rwfus is already installed.

TODO: If run without options:

1. Check if rwfus is installed in the default location, or if a config file is passed in, check there.
2. If installed, print the status of rwfus unit files
3. Else, ask if it's alright to install rwfus to the default location, and get user confirmation
4. sudo $0 --install --logfile "$Logfile" $@ (is this sane?)