* 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.
* Also now stores PID in per-service file in configured logs directory.
* Swapped the environment arg and service so it's, e.g. "live gateway"
now.
* New optional third arg `--from-source` to... run from source, not
installed files. The script *will* exit and redirect output, but
record the PID and tell you it.
New SRC_DIR in the config files to know where to run from.
