[Nut-upsuser] Lupus 500 MEC0003 Problems

[hyouko at gmail.com]

> Works more or less OK but for 36 secs creates an index of 0x1f (should be
> 0x20) and for 42 secs creates 0x2f.   30, 48 and 54 secs work OK.
> I added forced type conversion with rounding in the driver program and then
> everything worked OK

My fault, fixed.

Plus, I changed the way the driver matches the usb devices, so that
your UPS should now be able to be recognized without specifying
subdriver/VID/PID.
Just specifying the driver/port in ups.conf should suffice now.

Here's the updated driver:
https://github.com/zykh/nut/tree/fabula-updated2

Let me know if it works.