[Nut-upsdev] RFC about adding new variable (ups.runtime)

[Michal Soltys]

Namely something like:

ups.runtime - amount of seconds since powering up

The reason is essentially "side effect" of this bug report:

http://article.gmane.org/gmane.comp.monitoring.nut.user/7705

Where T denotes total time since ups' power up. On upses with AP9612TH 
it's used for dual temperature sensors (which top of apcsmart branch 
should gracefully support).

Either way, would be nice to handle that already and provide one or the 
other depending on detected format.