Werk #7977: NagVis: Updated to 1.9.13

Component	Other components
Title	NagVis: Updated to 1.9.13
Date	Jul 17, 2019
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.6.0b4 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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