Better management for .tex directories to build from tarball

In order to collaborate effectively in the project, even project members
that don't necessarily want (or have the capacity) to do the whole analysis
must be able to contribute to the project. Until now, the users of the
distributed tarball could only modify the text and not the figures (built
with PGFPlots) of the paper.

With this commit, the management of TeX source files in the pipeline was
slightly modified to allow this as cleanly as I could think of now! In
short, the hand-written TeX files are now kept in `tex/src' and for the
pipeline's generated TeX files (in particular the old `tex/pipeline.tex'),
we now have a `tex/pipeline' symbolic-link/directory that points to the
`tex' directory under the build directory.

When packaging the project, `tex/pipeline' will be a full directory with a
copy of all the necessary files. Therefore as far as LaTeX is concerned,
having a build-directory is no longer relevant. Many other small changes
were made to do this job cleanly which will just make this commit message
too long!

Also, the old `tarball' and `zip' targets are now `dist' and `dist-zip' (as
in the standard GNU Build system).

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