Removed unused variables

Ignore-this: 2d85a747333844701c2588ce6d2b8a0

darcs-hash:20100121125355-1e3d8-4e952689037e9dd168a8bf2083ef320a6aac9ecb
Fixed FileBackend which opened the configuration file twice

Ignore-this: 8fdd51ff7b93975e8a3d4da6c3b8a77e

darcs-hash:20100121125449-1e3d8-90fb5d8a9a4a5308b9c660e2be0d3268aec0f713