* all relevant adblock events will be properly written to syslog/stdout
* removed needless 'debug log' option
* add optional parm 'adb_forcedns' to redirect all queries to local
resolver (default: '1', enabled)
* revised space check
* various code cosmetics & cleanups

Signed-off-by: Dirk Brenken <openwrt@brenken.org>

* fix ip6tables reject types
* simplified firewall ruleset for IPv4/IPv6
* fix memory detection (swap was always 0)
* fix dnsmasq restart after partial restore
* ad hotplug support, adblock will be started when wan interface comes
up
* change adblock init script accordingly, do nothing on 'boot'
* optimize wget parameters for faster download results (in case of an
error)
* added CC installation notes to readme
* removed needless external online check
* removed needless optional parms 'adb_maxtime', 'adb_maxloop',
'adb_probeipv4' and 'adb_probeipv6'

Signed-off-by: Dirk Brenken <openwrt@brenken.org>