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Firstly, we remove the use of global variables; this is done by
introducing a 'globals' structure for each of these files and
passing it internally between functions.
Next, split the core of pdfclean_main into pdfclean_clean, and the
core of pdfinfo_main into pdfinfo_info.
The _main functions now do the argv processing. The new functions now
run entirely thread safely, so can be called from library functions.
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No more caching a flattened page tree in doc->page_objs/refs.
No more flattening of page resources, rotation and boxes.
Smart page number lookup by following Parent links.
Naive implementation of insert and delet page that doesn't rebalance the trees.
Requires existing page tree to hook into, cannot be used to create a page tree
from scratch.
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For historical reasons lots of the code uses "xref" when talking about
a pdf document. Now pdf_xref is a separate type this has become
confusing, so replace 'xref' with 'doc' for clarity.
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