Werk #1783: Finish the view "History of Scheduled Downtimes"

Component	User interface
Title	Finish the view "History of Scheduled Downtimes"
Date	Dec 16, 2014
Level	Prominent Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Add missing filters, group by Host/Service

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