Revert "kalua: pdf_output()/mail: encode_quoted_printable() - some debug help for seldom errors during PDF generation"
truely it was an Microsoft Outlook bug described here: (M$ s*cks!)

http://support.microsoft.com/default.aspx?scid=kb;en-us;923087
http://www.office-loesung.de/ftopic64981_0_0_asc.php

In short: Outlook sometimes garbles/mixes_up PDF-files if mails are fetched from POP3 (!!!)

This reverts commit 895e0aa0bc514702c00d6d52eb2b9f5cab6ddcdd.