Each appendix moved to a separate .tex file

As recommended by Lorena Barba (editor in chief of CiSE), we should prepare
the appendices as a separate "Supplement" for the journal. But we also want
them to be appendices within the paper when built for arXiv.

As a first step, with this commit, each appendix has been put in a separate
'tex/src/appendix-*.tex' file and '\input' into the paper. We will then be
able to conditionally include them in the PDF or not.

Also, as recommended by Lorena, the general "necessity for reproducible
research" appendix isn't included (possibly going into the webpage later).

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