Feature request: Protect aktive alarms

[joh]

An active alarm (counting or ringing) should not be edited or deleted. Make these options only available for alarms while they are not started.

This is related to bug #865213, but includes editing.

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Imported from Launchpad using lp2gh.

• date created: 2014-06-11T12:39:12Z
• owner: k-bielke
• the launchpad url was https://bugs.launchpad.net/bugs/1328892