libs/core: rework class structure of network model, add per protocol is_installed() and opkg_package() utility functions to query availability

libs/core: clean up network model, make it modular and move protocol deviations into submodules, fix recognition of pptp and properly implement relayd protocol awareness

modules/admin-full: increase button size on overview pages to accomodate for longer words in other langauges

applications/luci-multiwan: add status indicators, patch by Etienne Champetier <etienne.champetier@free.fr> (#260)

themes/base: xhr.js: implement running(), run() and halt() to check, start and stop the AJAX poll queue

modules/freifunk: Move profiles and common files into seperate packages, this will enable us to build freifunk images without luci.