New feature emonhub log download

Building on @joyrider3774 's excellent work adding log download options to the admin page I have ported the same feature over to the emonhub config module

While I was at it I added a link to the emonhub documentation and config help info. Please report any bugs here. Should be a useful feature when debugging systems. Users can download a full emonhub log.

Changes can be pulled in by running emonpi update.

That was @joyrider3774’s excellent work, not mine :slight_smile:

Wops sorry, @joyrider3774! I’ve made the correction. Sorry I got mixed up :disappointed: