[poppler] std::unique_ptr

[Carlos Garcia Campos]

I've started to play with using std::unique_ptr in poppler now that we
are using C++11. I've just submitted a new branch unique_ptr on top of
better_object branch. For now I've only changed Annots. I'll move other
files in follow up commits when I find some more time.

Regards, 
-- 
Carlos Garcia Campos
PGP key: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x523E6462
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