Werk #1992: df: Show usages near to zero with a higher precision - not simply as 0.00

Component	Checks & agents
Title	df: Show usages near to zero with a higher precision - not simply as 0.00
Date	Feb 9, 2015
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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