fixed offline ratio sometimes beeing calculated as negative (close to zero) value, which then was displayed as NaN in the frontend
ugly fix for importing the retry-decorator submodule. better solutions wanted.
new NameDB implementation (OOP) which saves not just the name and the id of a node but the other node macs as well.
some new methods ensuring the usage of a nodes id and not one of its macs. a new config option defines the path for the mac database.
make the other modules use the new NameDB. graphs are now only generated for rrd databases that match a node id. update.py ensures to save data only to the rrd matching the nodes id, so that rrd databases are not mistakenly created for node macs (sometimes batman data yields another mac of a node as the node id, instead of its real id)