Fixed sending of spurious MediaStreamDidFail notifications

Ignore-this: aa5ab6d6e6b1ee615e42aa23bb89bee1

darcs-hash:20091126201408-b22ec-4741d3c7ae3f8c99a1f8d311b15dbb4420107f80
Fix xcap-directory so it uses new configuration backend

Ignore-this: ac78542df120458be692a4c286dbdc0e

darcs-hash:20091127102128-56b4d-108765fcb0597e5f9cd023000a19a98cc1895124