[OEM-255] retain old pdf print method
[OEM-255] support for WKHtmlToPDF printing.
[OEM-255] set page breaks for letters
[OEM-255] bugfix
[OEM-255] page margins are set using wkhtmltopdf now
[OEM-255] print all letters in html mode.
[OEM-255] fixed letter printing when PDF printing is disabled.
[OEM-255] removed commented line