[configs] add lib-guard, statistics-default and olsrd-mod-txtinfo
[packages] add freifunk-berlin-statistics-defaults
[packages] refactor packages

remove kmod-ipt-nat, luci-app-firewall and 6in4
[packages] add olsrd-mod-txtinfo

olsrd-mod-txtinfo is needed for luci-app-statistics
[packages] add collectd-mod-uptime and -mod-memory
[feeds] add support for statistics

* add package freifunk-berlin-statistics-defaults
* integrated support for luci-app-statistics into ffwizard-berlin