[Nut-upsuser] apcsmart update info

[Michal Soltys]

I've merged apcsmart branch with master, so it should cover past issues 
mentioned on the mailing list - among those:

- it's possible to select canonical and non-canonical mode - with the 
latter functioning as in apcsmart-old
- CR is back to ignored characters, as IGNCR was not honored in some 
cases (mainly windows machines)
- mutilvalue variables are now supported
- the driver can distinguish cases where one variable can mean different 
things (currently 'T') depending on model
- some compatibility entires updated
- adjusted approach to compat entries where 'b' returns voltage related 
info instead of firmware

Thanks to Markus Pruehs and Steffen Plotner for all the feedback they 
provided !