Merge git://github.com/andreasots/vindicat

TUN interface code imported
a not-too-god solution for device merging
PrefixMap::erase compiles now
NetworkMap: recognize our own device by id
NetworkMap: fix null dereference on adding new link; runs
ConnectionPool is just a map
InterfaceHandler.cpp: variable name
Merge git://github.com/andres-erbsen/vindicat