Alg performance data on benchmark variants

This data contains algorithm performance data on variant problems for our paper: ASOC-D-20-02502_R1 'On the Diversity and Robustness of Multi-Objective Test Suites'. There are several new instances (versions) of the ZDT, DTLZ and WFG benchmark problems with changes to their initialised construction parameters, augmenting their characteristics with the domain presented in our paper.