Werk #3247: Do not allow multiple BI aggregates with the same title

Component	BI
Title	Do not allow multiple BI aggregates with the same title
Date	Feb 26, 2016
Level	Prominent Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.2.8b3 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Doing that leads into several anomalies and strange behaviour. The BI titles must be unique. This is now enforced and an error printed in cased.

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