Corrected package distribution step and not including BibLaTeX packages

I was using some special Bash feature before to ignore the distribution
directory itself when copying the files, but that had some problems, so I
just used a simple for loop over a `find' command to ignore it. Also, for
now, we don't need BibLaTeX sources in the project (that is primarily for
arXiv), so to help the referee see a more cleaner contents of this
supplement file.

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