Renamed initial paper to paper-long.tex, to write shorter new version

We just recently recognied that the final paper should not be longer than
8000 words. The easiest way was just to start a new `paper.tex' and bring
in parts from the original/long version. We can use all the hard work that
went into writing the long paper later (possibly in a manual for
Maneage). So I don't want to suddenly distroy its history at this point.

To let Git know about renaming the original `paper.tex' to
`tex/src/paper-long.tex', I am making this commit. This commit doesn't have
any `paper.tex' and only records the fact that it has been renamed. In the
next commit, I'll re-create `paper.tex' which will host the short/final
version. But thanks to this commit, if we later make any changes to long
version, Git will know that it was originally the main `paper.tex'.

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