[poppler] Addition of stream::getChars

[Albert Astals Cid]

Hi, this patch implements getChars as improvement to the getChar interface, 
just by making the number of function calls smaller, i get around 10% speed 
improvements in PDF files like 28225 and thought the number of changed lines 
is quite big it doesn't add much code duplication (it removes some) so it 
should not make code more difficult to maintain.

I've run it thorugh my test suite and did get 100% exact results as the one we 
get now.

If noone disagrees i'll commit it to trunk on wednesday european night.

Albert
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