Extra [s|o]office cmd line batch options

Hi folks,

played a bit with Muthu's / Florian's
desktop-cmd-bulk-conversion.diff tonight, which provides a nice
-convert-to option for bulk format-A-to-format-B conversion.

This convers pdf export already, I was just missing a way to
also exercise the plain printing code paths inside OOo (pdf export
is almost, but not exactly, the same) - so now there's also a
-print-to-file option (see patch, or soffice -h for further info).

Especially useful for doing regression testing with Caolan's neat
convwatch pixel comparison technique; Miklos & me hacked up a quick
script to compare two ps files page-by-page, for the while here, but
should move into ooo-build/bin (and eventually replace ooconvwatch
there):

http://users.freedesktop.org/~thorsten/oodocdiff.sh

Generating jpegs from the postscript is absolutely dwarfed by OOo
doing the printout, so caching those (like the java convwatch can
do) is imo not useful - but sticking some reference PS into an extra
repo is something we should definitely consider.

What do you think?

-- Thorsten

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