Windows test bails with path too long error

[nikohansen]

IOError: [Errno 2] Some of the files cannot be extracted from "C:\Users\ci\.cocopp\data-archives\numbbo.github.io\data-archive\data-archive\bbob-biobj\2019\IBEA-platypus_Brockhoff_bbob-biobj.tgz". The path is too long.

The pathname has 131 characters.

see https://ci.inria.fr/numbbo/job/Coco-dev-nightly-win/dotype=test-postprocessing-all,label=numbbo-win/1937/console

[nikohansen]

The _bbob-biobj in the data file name seems quite superfluous.

[nikohansen]

See also numbbo/data-archive#3

[brockho]

The actual path to the data is not too long at all for Windows, the problem is the combination with the structure inside the data sets which gets extracted by the postprocessing (and the combined path is then too long).

For the data set in question (IBEA), there were quite some very long folder names within the .tgz file which I removed and shortened without altering the data itself of course. Now, everything works well such we can solve the issue.

We should, however, take care that those too deep folder structures within future data sets are shortened when we uploading the data. The general shortening of the path names, suggested in numbbo/data-archive#3 is also an option of course.