removing strict mode

There's a lot of code in this extension that relies on strict mode being
off.
throwing errors in isManaged returns false

interceptFrame.attrs doesn't always exist. There won't be an error
manager in that case and, the test blows up. I'm just catching that
error and returning false from isManaged, since the error isn't managed.
removing patch to setNextCommand

This was breaking everything, so I took it out. It was only used on the
server and only broke things on the server...
rebuilds user extension with latest selbench

I've updated the user-extension for selbench as well. They go together.