* allow mounting `/` (the entire filesystem) as a volume
* not that you should (really, you shouldn't)
* improve `-v` helptext
* change IdP group symbol to @ because % is used for file inclusion
* not technically necessary but is less confusing in docs
connections from outside the specified list of IP prefixes are rejected
(docker-friendly alternative to -i 127.0.0.1)
also mkdir any missing folders when logging to file