Bi-directional text.

Hello,

OpenDocument only supports bidi up to the paragraph level:

* Section 15.2.19 - Page writing mode - p. 547
* Section 15.5.36 - Paragraph writing mode - p. 591
* Section 15.7.8  - Section writing mode - p. 599
* Section 15.8.13 - Table writing mode - p. 603

The writing mode attribute should also apply to the <text:span> tag so 
we can have (e.g.) LTR text inside a RTL paragraph.

Cheers,
Daniel.
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