[poppler] Using OpenJPEG for JPXStreams

[Albert Astals Cid]

Hi, attached a patch that makes poppler use OpenJPEG[1] for JPX streams 
(JPEG2000) instead of the internal decoder.

What we win:
 * Less code to maintain. Huzzah!
 * Code that is easy to understand. Huzzah!
 * Works with more PDF, for example works with the one at poppler bug 15629. 
Huzzah!
 * Seems to have less peak memory usage, for example massif reports a peak of 
33,445,880 bytes using internal decoder and the pdf of kde bug 157800 while 
with the new code it reports a peak of 12,502,744 bytes. On the other hand 
i'm not a massif expert so i may be doing something wrong. Half Huzzah!
 * Seems somewhat faster. Half Huzzah!

That's 4 Huzzah! Not bad ;-)

I'd like you to test the patch, as i just have 11 PDF using JPX streams.

If noone finds any reason i should not commit this patch (like any PDF that 
fails), i'll commit this to master git branch in a week.

Albert

[1] http://www.openjpeg.org/
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