[Bf-docboard] PDF generation working again

[Campbell Barton]

Hi, I also checked on converting the HTML to PDF.

This uses the "singlehtml" generator, then wkhtmltopdf to convert to the PDF.

Its quite large so this is just the getting started chapter
http://download.blender.org/ftp/ideasman42/blender_manual_html_getting_started.pdf
(5mb)

The full PDF,
http://download.blender.org/ftp/ideasman42/blender_manual_html.pdf (70mb)

The main issue is it misses cross-references, that can be supported
but involves compiling a patched QT version:
http://stackoverflow.com/questions/9506276/internal-links-with-wkhtmltopdf

Am not *against* this, but it remains a bit of a hassle.
Nevertheless, if only one person needs to setup the patched QT,
we can at least use it without the overhead of having to output to
latex (and resolve issues noted in previous mail).