Werk #4: df: dynamic filesystem levels now reorder levels automatically

When defining several step for dynamic filesystem levels, e.g. one for disk greater then 10GB, of for disks greater then 100GB and one for filesystems greater then 0B (the rest), then you had to make sure that the step for lagers disks would appear later. Otherwise they would be ignored. This is now fixed and Check_MK automatically chooses the correct step for a disk - regardless of the order.

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