These are what I was using on my home server to test the prior code
changes to how the Gateway code reports errors.
Ultimately these should become a part of proper tests, but for now
they're at least in the repository for anyone to utilise.
* Removed scripts/run-from-source.sh as it's now redundant.
* Added `--background` optional argument, only for when using
`--from-source` to start-eddn-service. The script will leave the
service in the foreground, no output redirection, without it.
It tells you the PID of the process when it's backgrounded, as well as
placing it in the appropriate .pid file.
