Werk #3914: Roles: Aliases are now unique during cloning

Component	Setup
Title	Roles: Aliases are now unique during cloning
Date	Sep 30, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i2 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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