[poppler] Last kpdf related patch (ok, i lied when say last one was last)

[Albert Astals Cid]

This one adds some getters in TextOutputdev we are using to try to get real 
textlike selection char by char.

Ok to commit?

After that if we relase 0.5.1 we will probably change kpdf trunk and oKular 
(kpdf future probable replacement) to use it.

Albert
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