Added the odfpyexport.py script to KSpread to produce custom OpenDocuments.

* The script uses the ODFPY python module (<a href="http://opendocumentfellowship.org/projects/odfpy">http://opendocumentfellowship.org/projects/odfpy</a>;) to produce opendocument text files from within the KSpread sheets.
* Needs improvments within next days once the cmake-upgrade + whole recompile is done. Shouldn't be difficult to also add export to .g. OpenDoc Presentation ;)
* It's just an example how to use Kross+KSpreadScripting to produce easy custom opendocuments from within KSpread.
* Fantastic work done on the python-module, Soren. A lot of thanks!