Parameterized {jailbase,jaildir}
Replaced all usages of /usr/jail with $jaildir
Explicitly fail if $os isn't FreeBSD
Removed $__type/files/ as it is pointless to have now
Updated man page
fixed remote copy command
fixed problem with code-remote when jail_enable wasn't in rc.conf
fixed problem with code-remote when jail_list wasn't in rc.conf
added check to see if /etc/devfs.rules exists before trying to use it
added dependency on __directory/usr/jail
