addbatchoutput deprecated by pvoutput

[jwillemsen]

I found recently that pvoutput has deprecated the addbatchoutput API, batching is now part of addoutput, but batching is only available for donations mode, see jwillemsen/saj_collector#34. It looks this project needs to be updated because it uses addbatchoutput at

solax-php/lib/PVOutput.php

Line 51 in aa4dbe0

$c = $this->prepareRequest($this->endPoints['addBatchOutput']);