seperate perfdata munging into its own method
use NagaExit in filesystem(..)
cpu: change perfdata, add units
stramline number formatting in finish and perfdata
update TestCpu, use AssertAlmostEqual for floats
fix bug in format_num (didnt expect long)
load: update perfdata to play nicer with rrd/nagiosgraph
test: add test for format_num(..)
make libels in cpu and load more consistent with nagiosgraph
update tests to account for last commit
disk: change perfdata format and update test
filesystem: put quotes around filesystems in perfdata and update tests
filesystem: modify perfdata to be more conformant to nagios plugin guidelines
cpu: fix unit/percentage error, and test