Discussion on issues with POSIX and minor edits to shorten paper

Konrad raised some very interesting points in particular about the
limitations of POSIX as a fuzzy standard that does not guaratee
reproducibility. A relatively long paragraph was thus added in the
discussion to address this important point.

In order to fit it in, the paragraph on "unwanted competition" was removed
since the POSIX issue was much more relevant for a curious
reader. Throughout the text, some other parts were edited to decrease the
length of the paper while making it easier to read.

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