Add copyright note to monopsen PDF

[pdaengeli]

We agreed to include a short © statement in the footer of the PDF pages (possibly with some opacity): "© Parzival-Projekt, Universität Bern, $year"

I think we can prepare a template document with that info, say copyright-template.pdf, and then merge it into the page using

pdftk monopsen-pdftk-updated-links.pdf background copyright-template.pdf output monopsen-pdftk-updated-copyrighted.pdf

or

pdftk monopsen-pdftk-updated-links.pdf stamp copyright-template.pdf output monopsen-pdftk-updated-copyrighted.pdf

Should be easy to chain this with what we did previously:

Merging the single files using pdfunite $(ls -v *.pdf) monopsen.pdf yields monopsen.pdf.

FWIW, it isn't hard to replace the links:

pdftk monopsen-pdftk.pdf output foo.tmp
parallel sed -i -e 's/\(https\?\)\(.*\)parzdb.*dreissiger=\([0-9]\+\).*\()\)/https\2fassungen\/\3\4/' -- foo.tmp
pdftk foo.tmp output monopsen-pdftk-updated-links.pdf compress

monopsen-pdftk-updated-links.pdf

Using pdftk we get pages of varying size, but it might be good enough.

Edit: no changes to the text according to diff <(pdftotext -layout monopsen-pdftk.pdf /dev/stdout) <(pdftotext -layout monopsen-pdftk-updated-links.pdf /dev/stdout)
Edit 2: no visual changes according to diff-pdf-visually monopsen-pdftk.pdf monopsen-pdftk-updated-links.pdf:

  Temporary directory: /tmp/diffpdf-4kqqhns4
  Converting each page of the PDFs to an image...
  PDFs have same number of pages. Checking each pair of converted images...
Min sig = inf, significant?=False. The PDFs are the same.

Originally posted by @pdaengeli in #17

We can wrap this in a script and run it in the pipeline to facilitate later updates.

For now however, the plan is to do a "final" conversion mid December. Might need to reach out to SA to share new PDFs then.

(@domsteinbach, I think you were interested in the PDF workflow, so tagging you here)

[pdaengeli]

Also change the file name to Monotext.pdf in accordance with #144.

Edit: new name eintextedition.pdf (see #178)

[pdaengeli]

Merging the files is now part of the static API (./parzival-static-api.sh --generate-monopsis). Let's wait for feedback on the copyright line (and perhaps metadata).