[poppler] pdftoabw patch

[Dominic Lachowicz]

Attached is a patch to pdftoabw. It should probably be split into
multiple patches, but it's pretty small and easy to follow. It:

*) Allows you to save to a file other than stdout
*) Checks for error conditions when reading the PDF doc and writing the ABW doc
*) Removes dead code in pdftoabw.cc
*) Fixes a SEGV I encountered when converting my new home's floor plan
*) Returns proper error conditions should the conversion fail for any reason

If someone (Jeff?) could review this, I'd appreciate it. I'm in the
process of writing an AbiWord plugin that uses pdftoabw, at least
until I bind this to poppler's glib API.

Best,
Dom
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