0) Uses 'www' user and group instead of 'orion' user and group
1) Added pkg-install to add www user and group if necessary
2) Fixed STARTUP_ORDER at 020 because the pkg-plist supports no
other value
3) Executing pkg-install from the pre-install target
4) Fixed the pkg-plist (it's different because Orion is not
automatically started and it creates some files at first
startup)
5) Bumped PORTREVISION to 3
