discoverer: Start discovering next URI from right thread
When using the cache, we were not using the right GMainContext to setup next URI to discovery, fix that.
Due to an influx of spam, we have had to impose restrictions on new accounts. Please see this wiki page for instructions on how to get full permissions. Sorry for the inconvenience.
When using the cache, we were not using the right GMainContext to setup next URI to discovery, fix that.