apcupsd client driver

Author: Andreas Steinmetz

https://alioth.debian.org/tracker/?func=detail&atid=411544&aid=313846&group_id=30602
apcupsd-ups: miscellaneous cleanup
apcupsd-ups: Remove multiplier from ups.load
apcupsd-ups: Additional variables
apcupsd-ups: Update man page with variables and units
apcupsd-ups: link to man page from README

Patch by Arnaud: https://alioth.debian.org/tracker/index.php?func=detail&aid=313846&group_id=30602&atid=411544
Merge branch 'apcupsd'

Conflicts:
	drivers/Makefile.am