[poppler] functions for boxes bounding all text in a page

[sgerwk at aol.com]

Hi,

I wrote a couple of functions for finding the area used by text in a page; it
returns an number of PopplerRectangle that should enclose all text as strictly
as possible. Another function returns the smallest rectangle covering all text,
like 'gs -sDEVICE=bbox' does in postscript.

The enclosed test program can be run by 'pdfrects file.pdf' and produce a new
pdf file 'result.pdf' with the rectangles drawn in various colors.

They may be used for example for copying text from two-column documents, to
zoom to the area actually used in the page, for creating a new document better
suited for small-screen devices such as tablets, ebook readers and mobile
phones.

If you think such functions may be of general use I may make a patch to
incorporate them in poppler.

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