fix refobj logic

[baentsch]

• utility scripts: more resilient & amenable to error analysis
• UI logic for determination of reference object corrected when changing algorithm set over time

Question to @dstebila : We're collecting all data since Oct 4 into the website display (and the file site.tgz): Shall we keep doing this or become more selective? "Oct 4" is actually a parameter in gen_website.sh...

[dstebila]

Question to @dstebila : We're collecting all data since Oct 4 into the website display (and the file site.tgz): Shall we keep doing this or become more selective? "Oct 4" is actually a parameter in gen_website.sh...

Unclear to me. Let's reflect on the purpose of presenting it as a time series. I understand it serves two purposes: seeing how performance changed after important commits were merged, and providing a visual average over time (effectively adding more data points).