[poppler] Supporting PDF 1.6 UserUnit

[Brad Hards]

Until PDF 1.6, the universe was scaled to 72dpi. 

That isn't true anymore - there is now a per-page dictionary value that 
specifies the resolution. It is called UserUnit (see pg 122 of the spec).

Now I don't have any PDF documents that use this, and I can't figure out how 
to make Acrobat 7.0.2 produce one. So maybe it isn't that widely used. 
However a quick scan of the poppler source tree suggests that this might not 
be a fairly widespread change, so maybe we should get to it soon?

Thoughts on this?

Brad
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