Add the ability to download the report in odt format

[DimitrisTzellis]

Along with being able to export the report as a .zip or a .docx file, exporting the report as an OpenDocument Text (.odt) file.
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Interoperability with open source software. No ties to proprietary office suites.
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LibreOffice, OpenOffice
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[kevin-atnos]

Hello,

This was changed in the latest version. Now you can download an .odt file.
Also, we added date in the filename.

You can download the latest version there:
https://github.com/LINCnil/pia/releases/latest

Sincerely,

Kevin