extensions/main: when processing a Pipe item, ensure that alan-pipe will be called with the same profile and configuration directory as the parent.

This also required the storage of 'directory' and 'profile' in the Configuration object.
Added extensions/logout_vera.py, a logout extension modified for vera.
Added logout_vera watcher (which doesn't work because we now need to look in dconf)
Uh, forgot to git add the logout_vera watcher.