[O] [RFC][ODT] Converting to pdf (or other formats) via odt

[Jambunathan K]

Thanks to Giles[1] for introducing us to the "--convert-to" option of
soffice.exe.  The option seems to be a fairly recent development[2].

With this change, one can export to pdf (or any other popular format)
via odt by a simple

#+begin_src emacs-lisp
  (setq org-export-odt-preferred-output-format "pdf")
#+end_src

There is no need to install additional converters. It is assumed that
the user has a working and fairly recent LibreOffice installation.

Footnotes: 
[1] 
http://imperfectsoftware.blogspot.in/2012/01/one-of-my-less-enjoyable-tasks-is-to.html

[2] There seems to be a bunch of fairly recent bugs with this option. So
a cutting edge LibreOffice would definitely be needed.

http://www.google.co.in/search?q=headless+%22--convert-to%22+site%3Alibreoffice.org&btnG=Search&sclient=psy-ab&hl=en&site=&source=hp&gbv=1&sei=L_gqT97rIMXorAf248C6DA

Feedback welcome.
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