Werk #8292: Fix small memory leak when deleting downtimes, add validation for downtime depth

Component	The Checkmk Micro Core
Title	Fix small memory leak when deleting downtimes, add validation for downtime depth
Date	Jul 20, 2015
Level	Prominent Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i3 Checkmk Enterprise (CEE), Checkmk MSP (CME)

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