* add bind support (see readme)
* export all blocked domains in one central file (adb_list.overall)
* prerequisite for proper bind support
* much faster sort operation with less memory consumption
* backups are still handled per source separately,
to be more flexible in adding/removing block list sources
* add additional 'wan6' interface trigger in default configuration
* various small fixes & optimizations
Signed-off-by: Dirk Brenken <dev@brenken.org>