[css-writing-modes-3] Prince 10 rev 4 implementation report

Peter,

http://www.gtalbot.org/BrowserBugsSection/CSS3WritingModes/implementation-report-Prince-10-rev-4-20150904.txt

Test not checked are those testing 'text-orientation', 
'text-combine-upright' and 'writing-mode: vertical-lr' because Prince 10 
does not support those.

I've added the success / failure percentage at the end of file.

Let me know if there is something wrong or missing.

Gérard
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