aurora 20071208 released

along several bugfixes, speed-ups and small feature additions, from now on aurora switches from xml to yaml as for config files. xml-support will not be dropped. they co-exist with each other.

i'm currently developing a new db-api and model-system, replacing the old ones. hopefully the new db-api will be usable around the first two weeks of 2008. contribution, advices and ideas are always welcome.