Add smoke test including real template

[ArchibaldBienetre]

Postponed task from #49 and #58 .

May be tricky to do before https://github.com/SergelsOrg/csv2tex/issues/48 is implemented

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• [ ] Also, we should add a simple integration test that runs the (half year) template, and checks that this does not fail (DAU proofing for future local changes) - in generation of Latex code and replacement in template #60 we could not do it yet

A bit tricky, currently, because, for example, #48 is not done yet. For the smoke test, I first have to install the missing packages.

Also, statements like \input{SchoolReportTemplate_ZeugnisTemplate_Commands.tex} need to be replaced with absolute paths, as we run the PDF transformation in a temporary directory, currently, to avoid side effects in the codebase, and because texi2pdf does not allow specifying an output file. But we can work around that

[ArchibaldBienetre]

Implemented by https://github.com/SergelsOrg/csv2tex/pull/75