* Device Availability Calculation
* Travis fix
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* schema corrections
* flexible duration
* travis
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* .
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* remove not needed code
* line Text to RRD
* update humantime
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* only set up again if device was marked as down
* set RRD area transparency
* save uptime also, to keep last availability as good as possible
* file description correction
* look for outages even if uptime > duration