* INIT-systemd use CADDYPATH instatt of HOME
* INIT-upstart use CADDYPATH instatt of HOME
* INIT-upstart use CADDYPATH instatt of HOME
* INIT-upstart use CADDYPATH instatt of HOME
* Remove unnecessary config options from systemd service so it will work with earlier versions of systemd. Simplify the systemd service instructions and make them more complete.
* Minor systemd README improvements.
* Add back some of the optional systemd 229 stuff but commented out for compat.
* A bunch of updates to the README for linux systemd.
The exemplary unit file for systemd is intentionally redundant at times, for
example dropping privileges which an unprivileged user "www-data" did not have
in the first place: To aid as fallback in case the file gets copied and an
operator setting UID to 0 (which reportedly happened in the past).