Avatars facing east: partially fixed

I am very happy to be honored with the commit access for the opensim (thanks guys!), and my first contribution was a relatively small bugfix for the avatar rotation problem - even though it is partial.

Now the rotation of the avatars is correctly shown, however the updates happen only when the avatar is walking - this required minimal code changes, and for fixing it for "in-place" rotation, I'd need some more discussion. But hey - you are no longer forced to face east, so it is a good first step, I think :)

Along with that went a small safety patch for the CLI - there were multiple occasions where the exception in the CLI (relatively harmless on its own), caused the entire sim to shutdown. Now it only prints the error message.