Various fixes improvements also typos corrected

1) Added xbmc to adm (its apparently required to be able to access system messages usb fix needs it.

2) Corrected typos on disable ATI underscan

3) Auto deployment of lm-sensors, discussed this a while back and nothing moved forward in 3 months so I'm adding it anyway.

NOTICE 
=

I could not submit a PR to master so had to go around it and do it here. please backport this yourself to master

one of the fixes here adding user to dialout was already in master where I copy and pasted this into here.

Blame it on Github or the excessive branching of same code.