Cleaned abstract and Section II to fit word limit

In the abstract the repeated benefits of Maneage (which are also mentioned
in the criteria) were removed to fit into CiSE's online submission
guidelines. In Section II (Longevity of existing tools), the paragraph that
itemized the following paragrahs as a numbered list has been removed with
the sentence that repeatedly states the importance of reproducibility in
the sciences and some branches of the industry.

With these changes our approximate automatic count has 6277 words. This is
still very slightly larger than the 6250 word limit of the
journal. However, this count is a definite over-estimation (including many
things like page titles and page numberings from the raw PDF to text
conversion). So the actual count for the journal publication should be less
than this.

A few other tiny corrections were made:

 - The year of the paper and copyright in 'README.md' was set to 2021. The
   copyright of the rest of the files will be set to 2021 after the next
   merge with Maneage soon (the years of core infrastructure copyrights has
   already been corrected there).

 - Mohammadreza's name was added in 'README.md'.

 - The line to import the "necessity" appendix has been commented in the
   version to have the full paper in one PDF (to be upladed to arXiv or
   Zenodo).

 - The supplement PDF now starts with '\appendices' so the sections have
   the same labels as the single-PDF version.

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