Fix to reload dbusers
Tidyup show service output
User interface improvements

Addition of enable/disable heartbeat, enable/disable root, list monitors,
show monitors

Better filter diagnostic output
Diagnostic update
Merge branch 'develop' into MAX-111
Documentation for MaxAdmin - rewrite of CLI command guide
Fix issue with OK being split across multiple reads
Merge branch 'develop' into MAX-111
Merge of new user interface changes