Werk #7662: NagVis: Updated to NagVis 1.9.1

Component	Other components
Title	NagVis: Updated to NagVis 1.9.1
Date	Jun 10, 2017
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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