Provide updated Flacoco results on popular benchmarks

Provide, as an appendix repository, an updated version of Flacoco's results on popular benchmarks such as Defects4J.

Start by reviewing the Flacoco repository and the linked paper to understand how benchmark results are produced and reported. Then determine the scope of the appendix repository and which popular benchmarks, including Defects4J, should be covered. Done means the appendix repository contains updated, clearly reported Flacoco results for the selected benchmarks.

Written by the indexing model from the issue text.