Meet fileTestSuite

[KOLANICH]

@GreyCat, @generalmimon, @armijnhemel, what do you think about https://github.com/fileTestSuite/fileTestSuite (an example of a compliant repo is https://github.com/implode-compression-impls/implode_test_files) ? Please note, this software and its deps are currently of alpha quality, extensive refactoring is being done, currently it contains memory-safety bugs, and all the commits land into the repos with the history being rewritten.

@generalmimon , I have already considered using reuse tool for that, but it'd be a bit painful to merge changes in dep5 files (and having a license file for each file is not ok, it'd only cause junk). So, reuse spec doesn't currently match the needs of that project.