Werk #1398: Allow to spread times of next check when rescheduling

When you do the action Reschedule active checks for more than one active checks then you now can enter a number of minutes. All checks will then be distributed evenly over that time.

This feature is interesting for checks with larger intervals. Most prominent example is the Check_MK Inventory check, which usually is done every 2, 4 or 24 hours. By spreading the executing of these checks you avoid large peaks in CPU load.

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