Updated feature: Answers export to PDF (user and admin gui)
Dev: Survey user: New header and questions and answers in tables (single answer export)
Dev: Admin user: New header in multiple answers export
Dev: Admin user: New config params in Global config -> Presentation
Merge pull request #250 from Aestu/2.06-answer_pdf_rework_rel5

Updated feature: Answers export to PDF (user and admin gui)